Hola a todos.
Ayer actualicé el sistema (tras aviso de octopi) y todo fue bien.
Cuando he arrancado hoy, tenía un escritorio único que cubría la pantalla del portátil y el monitor adicional, pero sin iconos ni la barra de tareas en la parte inferior.
He conseguido poner el plasmoide del lanzador de tareas y así puedo acceder a las aplicaciones y funcionar limitadamente.
Estoy buscando cómo restaurar la barra de tareas pero no encuentro información válida en internet.
¿Alguién me puede echar una mano?
Muchas gracias.

    demm

    ----------------------------------------------------------------------------------------------------------
    cat /etc/KaOS-release
    ----------------------------------------------------------------------------------------------------------
    inxi -Fxz
    ----------------------------------------------------------------------------------------------------------
    System:    Kernel: 5.7.19-1 x86_64 bits: 64 compiler: gcc v: 9.3.0 Desktop: KDE Plasma 5.19.5 
               Distro: KaOS 2020 
    Machine:   Type: Laptop System: Hewlett-Packard product: HP Pavilion g6 Notebook PC 
               v: 0691120000204610000620100 serial: <filter> 
               Mobo: Hewlett-Packard model: 1670 v: 09.37 serial: <filter> BIOS: Hewlett-Packard 
               v: F.33 date: 08/30/2011 
    Battery:   ID-1: BAT0 charge: 44.2 Wh condition: 44.2/44.2 Wh (100%) 
               model: Hewlett-Packard Primary status: Full 
    CPU:       Info: Dual Core model: Intel Core i5-2430M bits: 64 type: MT MCP arch: Sandy Bridge 
               rev: 7 L2 cache: 3072 KiB 
               flags: avx lm nx pae sse sse2 sse3 sse4_1 sse4_2 ssse3 vmx bogomips: 19156 
               Speed: 798 MHz min/max: 800/3000 MHz Core speeds (MHz): 1: 805 2: 802 3: 802 4: 833 
    Graphics:  Device-1: Intel 2nd Generation Core Processor Family Integrated Graphics 
               vendor: Hewlett-Packard driver: i915 v: kernel bus ID: 00:02.0 
               Device-2: AMD Seymour [Radeon HD 6400M/7400M Series] vendor: Hewlett-Packard 
               driver: radeon v: kernel bus ID: 01:00.0 
               Device-3: Cheng Uei Precision Industry (Foxlink) type: USB driver: uvcvideo 
               bus ID: 2-1.5:5 
               Display: x11 server: X.Org 1.20.9 driver: intel,modesetting unloaded: vesa resolution: 
               1: 1366x768~60Hz 2: 1920x1080 
               OpenGL: renderer: Mesa DRI Intel HD Graphics 3000 (SNB GT2) v: 3.3 Mesa 20.1.8 
               direct render: Yes 
    Audio:     Device-1: Intel 6 Series/C200 Series Family High Definition Audio 
               vendor: Hewlett-Packard driver: snd_hda_intel v: kernel bus ID: 00:1b.0 
               Sound Server: ALSA v: k5.7.19-1 
    Network:   Device-1: Ralink RT5390 Wireless 802.11n 1T/1R PCIe 
               vendor: Hewlett-Packard U98Z077.00 Half-size Mini driver: rt2800pci v: 2.3.0 port: 4000 
               bus ID: 04:00.0 
               IF: wlan0 state: down mac: <filter> 
               Device-2: Realtek RTL810xE PCI Express Fast Ethernet vendor: Hewlett-Packard 
               driver: r8169 v: kernel port: 3000 bus ID: 05:00.0 
               IF: eno1 state: up speed: 100 Mbps duplex: full mac: <filter> 
    Drives:    Local Storage: total: 465.76 GiB used: 342.57 GiB (73.5%) 
               ID-1: /dev/sda vendor: Hitachi model: HTS545050B9A300 size: 465.76 GiB 
    Partition: ID-1: / size: 136.50 GiB used: 107.92 GiB (79.1%) fs: ext4 dev: /dev/sda1 
    Swap:      ID-1: swap-1 type: partition size: 3.97 GiB used: 24.8 MiB (0.6%) dev: /dev/sda5 
    Sensors:   System Temperatures: cpu: 56.0 C mobo: N/A gpu: radeon temp: 54.0 C 
               Fan Speeds (RPM): N/A 
    Info:      Processes: 185 Uptime: 6h 21m Memory: 7.72 GiB used: 2.66 GiB (34.4%) Init: systemd 
               runlevel: 5 Compilers: gcc: 9.3.0 Packages: 1092 Client: Unknown Client: octopi 
               inxi: 3.1.06 
    ----------------------------------------------------------------------------------------------------------
    journalctl -b -p err
    ----------------------------------------------------------------------------------------------------------
    -- Logs begin at Wed 2020-09-23 06:46:36 CEST, end at Wed 2020-09-23 13:14:46 CEST. --
    sep 23 06:53:08 <HOSTNAME> systemd-udevd[217]: /etc/udev/rules.d/40-libsane.rules:26: GOTO="libsane_rules_end" has no matching label, ignoring
    sep 23 06:53:09 <HOSTNAME> systemd-udevd[217]: /etc/udev/rules.d/S99-2000S1.rules:26: GOTO="libsane_rules_end" has no matching label, ignoring
    sep 23 06:54:55 <HOSTNAME> dolphin[721]: inotify_add_watch(/lost+found) failed: (Permission denied)
    sep 23 06:54:58 <HOSTNAME> dolphin[721]: inotify_add_watch(/root) failed: (Permission denied)
    sep 23 06:54:59 <HOSTNAME> dolphin[721]: inotify_add_watch(/run/cryptsetup) failed: (Permission denied)
    sep 23 06:54:59 <HOSTNAME> dolphin[721]: inotify_add_watch(/run/openvpn-client) failed: (Permission denied)
    sep 23 06:54:59 <HOSTNAME> dolphin[721]: inotify_add_watch(/run/openvpn-server) failed: (Permission denied)
    sep 23 06:54:59 <HOSTNAME> dolphin[721]: inotify_add_watch(/run/sudo) failed: (Permission denied)
    sep 23 06:54:59 <HOSTNAME> dolphin[721]: inotify_add_watch(/run/udisks2) failed: (Permission denied)
    sep 23 06:55:00 <HOSTNAME> pulseaudio[716]: [pulseaudio] bluez5-util.c: GetManagedObjects() failed: org.freedesktop.DBus.Error.NoReply: Did not receive a reply. Possible causes include: the remote application did not send a reply, the message bus security policy blocked the reply, the reply timeout expired, or the network connection was broken.
    sep 23 06:56:04 <HOSTNAME> systemd-coredump[905]: Process 670 (baloo_file) of user 1000 dumped core.
    sep 23 07:21:39 <HOSTNAME> dolphin[2108]: inotify_add_watch(/lost+found) failed: (Permission denied)
    sep 23 07:21:39 <HOSTNAME> dolphin[2108]: inotify_add_watch(/root) failed: (Permission denied)
    sep 23 07:21:39 <HOSTNAME> dolphin[2108]: inotify_add_watch(/run/cryptsetup) failed: (Permission denied)
    sep 23 07:21:39 <HOSTNAME> dolphin[2108]: inotify_add_watch(/run/openvpn-client) failed: (Permission denied)
    sep 23 07:21:39 <HOSTNAME> dolphin[2108]: inotify_add_watch(/run/openvpn-server) failed: (Permission denied)
    sep 23 07:21:39 <HOSTNAME> dolphin[2108]: inotify_add_watch(/run/sudo) failed: (Permission denied)
    sep 23 07:21:39 <HOSTNAME> dolphin[2108]: inotify_add_watch(/run/udisks2) failed: (Permission denied)
    sep 23 07:24:25 <HOSTNAME> dolphin[2563]: inotify_add_watch(/lost+found) failed: (Permission denied)
    sep 23 07:24:25 <HOSTNAME> dolphin[2563]: inotify_add_watch(/root) failed: (Permission denied)
    sep 23 07:24:25 <HOSTNAME> dolphin[2563]: inotify_add_watch(/run/cryptsetup) failed: (Permission denied)
    sep 23 07:24:25 <HOSTNAME> dolphin[2563]: inotify_add_watch(/run/openvpn-client) failed: (Permission denied)
    sep 23 07:24:25 <HOSTNAME> dolphin[2563]: inotify_add_watch(/run/openvpn-server) failed: (Permission denied)
    sep 23 07:24:25 <HOSTNAME> dolphin[2563]: inotify_add_watch(/run/sudo) failed: (Permission denied)
    sep 23 07:24:25 <HOSTNAME> dolphin[2563]: inotify_add_watch(/run/udisks2) failed: (Permission denied)
    sep 23 07:49:40 <HOSTNAME> dolphin[2563]: Couldn't start kuiserver from org.kde.kuiserver.service: QDBusError("org.freedesktop.DBus.Error.ServiceUnknown", "The name org.kde.kuiserver was not provided by any .service files")
    ----------------------------------------------------------------------------------------------------------
    cat /etc/pacman.conf
    ----------------------------------------------------------------------------------------------------------
    #
    # GENERAL OPTIONS
    #
    [options]
    # The following paths are commented out with their default values listed.
    # If you wish to use different paths, uncomment and update the paths.
    #RootDir     = /
    #DBPath      = /var/lib/pacman/
    #CacheDir    = /var/cache/pacman/pkg/
    #LogFile     = /var/log/pacman.log
    #HookDir     = /etc/pacman.d/hooks/
    HoldPkg     = pacman glibc
    #XferCommand = /usr/bin/wget --passive-ftp -c -O %o %u
    #XferCommand = /usr/bin/curl -L -C - -f -o %o %u
    #CleanMethod = KeepInstalled
    Architecture = auto
    
    # Misc options (all disabled by default)
    #UseSyslog
    #ShowSize
    Color
    #TotalDownload
    CheckSpace
    VerbosePkgLists
    ILoveCandy
    
    # By default, pacman accepts packages signed by keys that its local keyring
    # trusts (see pacman-key and its man page), as well as unsigned packages.
    SigLevel = Never
    LocalFileSigLevel = Never
    #RemoteFileSigLevel = Required
    
    #
    # REPOSITORIES
    #
    [core]
    Include = /etc/pacman.d/mirrorlist
    [main]
    Include = /etc/pacman.d/mirrorlist
    [apps]
    Include = /etc/pacman.d/mirrorlist
    
    ----------------------------------------------------------------------------------------------------------
    pacman -Qm
    ---------------------------------------------------------------------------------------------------------
    bluefish 2.2.10-3
    celt 0.11.3-3
    crda 4.14-2
    gamin 0.1.10-4
    jasper 2.0.14-1
    kaptan 5.4.6-1
    keneric 0.3-2
    lcms 1.19-6
    libcl 1.1.12-1
    libglade 2.6.4-11
    libgpod 0.8.3-7
    libkolab 1.0.2-4
    libsidplay 1.36.59-7
    libxxf86dga 1.1.5-1
    networkmanager-dispatcher-ntpd 1.0-8
    pygtk 2.24.0-4
    python2-cairo 1.18.2-1
    python2-cython 0.29.14-1
    python2-gobject 2.28.7-5
    python2-gobject3 3.34.0-2
    python2-jinja 2.10.3-1
    python2-lxml 4.4.1-1
    python2-markupsafe 1.1.1-1
    python2-numpy 1.16.4-1
    python2-systemd 234-1
    python2-xlib 0.25-1
    qimageblitz 0.0.6.1-2
    wireless-regdb 2019.06.03-1
    
    ----------------------------------------------------------------------------------------------------------
    cat /var/log/pacman.log
    ----------------------------------------------------------------------------------------------------------
    
    [2020-09-22T06:40:39+0200] [PACMAN] Running '/usr/bin/pacman -Syu --noconfirm'
    [2020-09-22T06:40:39+0200] [PACMAN] synchronizing package lists
    [2020-09-22T06:40:40+0200] [PACMAN] starting full system upgrade
    [2020-09-22T06:41:07+0200] [PACMAN] Running '/usr/bin/pacman -Syu'
    [2020-09-22T06:41:07+0200] [PACMAN] synchronizing package lists
    [2020-09-22T06:41:08+0200] [PACMAN] starting full system upgrade
    [2020-09-22T06:45:04+0200] [ALPM] transaction started
    [2020-09-22T06:45:13+0200] [ALPM] removed jack (0.125.0-5)
    [2020-09-22T06:45:13+0200] [ALPM] upgraded elfutils (0.180-1 -> 0.181-1)
    [2020-09-22T06:45:13+0200] [ALPM] upgraded mesa (20.1.7-1 -> 20.1.8-1)
    [2020-09-22T06:45:13+0200] [ALPM] upgraded libxkbcommon (0.9.1-1 -> 1.0.1-1)
    [2020-09-22T06:45:13+0200] [ALPM] upgraded iana-etc (20200904-1 -> 20200910-1)
    [2020-09-22T06:45:13+0200] [ALPM] upgraded hwids (20200813-1 -> 20200813.1-1)
    [2020-09-22T06:45:13+0200] [ALPM] upgraded libldap (2.4.52-1 -> 2.4.53-1)
    [2020-09-22T06:45:13+0200] [ALPM] upgraded libgudev (233-3 -> 234-1)
    [2020-09-22T06:45:14+0200] [ALPM] upgraded qt5-base (5.15.0-2 -> 5.15.1-1)
    [2020-09-22T06:45:14+0200] [ALPM] upgraded kitemviews (5.74.0-1 -> 5.74.0-2)
    [2020-09-22T06:45:14+0200] [ALPM] upgraded karchive (5.74.0-1 -> 5.74.0-2)
    [2020-09-22T06:45:14+0200] [ALPM] upgraded kconfig (5.74.0-1 -> 5.74.0-2)
    [2020-09-22T06:45:14+0200] [ALPM] upgraded kcoreaddons (5.74.0-1 -> 5.74.0-2)
    [2020-09-22T06:45:14+0200] [ALPM] upgraded qt5-declarative (5.15.0-1 -> 5.15.1-1)
    [2020-09-22T06:45:14+0200] [ALPM] upgraded qt5-x11extras (5.15.0-1 -> 5.15.1-1)
    [2020-09-22T06:45:14+0200] [ALPM] upgraded kwindowsystem (5.74.0-1 -> 5.74.0-2)
    [2020-09-22T06:45:14+0200] [ALPM] upgraded kcrash (5.74.0-1 -> 5.74.0-2)
    [2020-09-22T06:45:14+0200] [ALPM] upgraded kdbusaddons (5.74.0-1 -> 5.74.0-2)
    [2020-09-22T06:45:14+0200] [ALPM] upgraded qt5-script (5.15.0-1 -> 5.15.1-1)
    [2020-09-22T06:45:14+0200] [ALPM] upgraded ki18n (5.74.0-1 -> 5.74.0-2)
    [2020-09-22T06:45:15+0200] [ALPM] upgraded kservice (5.74.0-1 -> 5.74.0-2)
    [2020-09-22T06:45:15+0200] [ALPM] upgraded js (68.11.0-1 -> 78.2.0-1)
    [2020-09-22T06:45:15+0200] [ALPM] upgraded polkit (0.117-1 -> 0.118-1)
    [2020-09-22T06:45:15+0200] [ALPM] upgraded ndctl (67-2 -> 69-1)
    [2020-09-22T06:45:15+0200] [ALPM] upgraded solid (5.74.0-1 -> 5.74.0-2)
    [2020-09-22T06:45:15+0200] [ALPM] upgraded kglobalaccel (5.74.0-1 -> 5.74.0-2)
    [2020-09-22T06:45:15+0200] [ALPM] upgraded kwidgetsaddons (5.74.0-1 -> 5.74.0-2)
    [2020-09-22T06:45:15+0200] [ALPM] upgraded kcompletion (5.74.0-1 -> 5.74.0-2)
    [2020-09-22T06:45:15+0200] [ALPM] upgraded qt5-svg (5.15.0-1 -> 5.15.1-1)
    [2020-09-22T06:45:15+0200] [ALPM] upgraded kauth (5.74.0-1 -> 5.74.0-2)
    [2020-09-22T06:45:15+0200] [ALPM] upgraded kcodecs (5.74.0-1 -> 5.74.0-2)
    [2020-09-22T06:45:15+0200] [ALPM] upgraded kguiaddons (5.74.0-1 -> 5.74.0-2)
    [2020-09-22T06:45:15+0200] [ALPM] upgraded kconfigwidgets (5.74.0-1 -> 5.74.0-2)
    [2020-09-22T06:45:15+0200] [ALPM] upgraded kiconthemes (5.74.0-1 -> 5.74.0-2)
    [2020-09-22T06:45:15+0200] [ALPM] upgraded sonnet (5.74.0-1 -> 5.74.0-2)
    [2020-09-22T06:45:16+0200] [ALPM] upgraded gstreamer (1.16.2-1 -> 1.18.0-1)
    [2020-09-22T06:45:16+0200] [ALPM] upgraded orc (0.4.31-1 -> 0.4.32-1)
    [2020-09-22T06:45:16+0200] [ALPM] upgraded gst-plugins-base (1.16.2-1 -> 1.18.0-1)
    [2020-09-22T06:45:16+0200] [ALPM] upgraded libsndfile (1.0.28-2 -> 1.0.29-3)
    [2020-09-22T06:45:16+0200] [ALPM] upgraded pulseaudio (13.0-3 -> 13.0-5)
    [2020-09-22T06:45:16+0200] [ALPM] upgraded qt5-wayland (5.15.0-1 -> 5.15.1-1)
    [2020-09-22T06:45:16+0200] [ALPM] installed jack2 (1.9.14-2)
    [2020-09-22T06:45:16+0200] [ALPM] upgraded gst-plugins-good (1.16.2-3 -> 1.18.0-1)
    [2020-09-22T06:45:16+0200] [ALPM] upgraded librsvg (2.48.8-1 -> 2.50.0-1)
    [2020-09-22T06:45:16+0200] [ALPM] installed vulkan-headers (1.2.153-1)
    [2020-09-22T06:45:16+0200] [ALPM] installed vulkan-loader (1.2.153-1)
    [2020-09-22T06:45:16+0200] [ALPM] installed vulkan-validationlayers (1.2.153-1)
    [2020-09-22T06:45:16+0200] [ALPM] upgraded libva (2.8.0-1 -> 2.9.0-1)
    [2020-09-22T06:45:16+0200] [ALPM] upgraded gst-plugins-bad (1.16.2-7 -> 1.18.0-1)
    [2020-09-22T06:45:16+0200] [ALPM] upgraded qt5-multimedia (5.15.0-1 -> 5.15.1-1)
    [2020-09-22T06:45:16+0200] [ALPM] upgraded qt5-speech (5.15.0-1 -> 5.15.1-1)
    [2020-09-22T06:45:16+0200] [ALPM] upgraded ktextwidgets (5.74.0-1 -> 5.74.0-2)
    [2020-09-22T06:45:16+0200] [ALPM] upgraded kf5-attica (5.74.0-1 -> 5.74.0-2)
    [2020-09-22T06:45:16+0200] [ALPM] upgraded kxmlgui (5.74.0-1 -> 5.74.0-2)
    [2020-09-22T06:45:16+0200] [ALPM] upgraded kbookmarks (5.74.0-1 -> 5.74.0-2)
    [2020-09-22T06:45:16+0200] [ALPM] upgraded kjobwidgets (5.74.0-1 -> 5.74.0-2)
    [2020-09-22T06:45:16+0200] [ALPM] upgraded knotifications (5.74.0-1 -> 5.74.0-2)
    [2020-09-22T06:45:16+0200] [ALPM] upgraded kwallet (5.74.0-1 -> 5.74.0-2)
    [2020-09-22T06:45:17+0200] [ALPM] upgraded kio (5.74.0-1 -> 5.74.1-1)
    [2020-09-22T06:45:17+0200] [ALPM] upgraded kplotting (5.74.0-1 -> 5.74.0-2)
    [2020-09-22T06:45:17+0200] [ALPM] upgraded kdesignerplugin (5.74.0-1 -> 5.74.0-2)
    [2020-09-22T06:45:17+0200] [ALPM] upgraded kitemmodels (5.74.0-1 -> 5.74.0-2)
    [2020-09-22T06:45:17+0200] [ALPM] upgraded kpackage (5.74.0-1 -> 5.74.0-2)
    [2020-09-22T06:45:17+0200] [ALPM] upgraded kdeclarative (5.74.0-1 -> 5.74.0-2)
    [2020-09-22T06:45:17+0200] [ALPM] upgraded kcmutils (5.74.0-1 -> 5.74.0-2)
    [2020-09-22T06:45:17+0200] [ALPM] upgraded akonadi (20.08.1-1 -> 20.08.1-2)
    [2020-09-22T06:45:17+0200] [ALPM] upgraded kfilemetadata (5.74.0-1 -> 5.74.0-2)
    [2020-09-22T06:45:17+0200] [ALPM] upgraded kidletime (5.74.0-1 -> 5.74.0-2)
    [2020-09-22T06:45:17+0200] [ALPM] upgraded baloo (5.74.0-1 -> 5.74.0-2)
    [2020-09-22T06:45:17+0200] [ALPM] upgraded bison (3.6.4-1 -> 3.7.2-1)
    [2020-09-22T06:45:17+0200] [ALPM] upgraded bluez-qt (5.74.0-1 -> 5.74.0-2)
    [2020-09-22T06:45:17+0200] [ALPM] upgraded kinit (5.74.0-1 -> 5.74.0-2)
    [2020-09-22T06:45:17+0200] [ALPM] upgraded kactivities (5.74.0-1 -> 5.74.0-2)
    [2020-09-22T06:45:17+0200] [ALPM] upgraded kwayland (5.74.0-1 -> 5.74.0-2)
    [2020-09-22T06:45:17+0200] [ALPM] upgraded qt5-quickcontrols (5.15.0-1 -> 5.15.1-1)
    [2020-09-22T06:45:17+0200] [ALPM] upgraded qt5-quickcontrols2 (5.15.0-1 -> 5.15.1-1)
    [2020-09-22T06:45:17+0200] [ALPM] upgraded qt5-graphicaleffects (5.15.0-1 -> 5.15.1-1)
    [2020-09-22T06:45:17+0200] [ALPM] upgraded kirigami (5.74.0-1 -> 5.74.0-2)
    [2020-09-22T06:45:17+0200] [ALPM] upgraded plasma-framework (5.74.0-1 -> 5.74.0-2)
    [2020-09-22T06:45:17+0200] [ALPM] upgraded kded (5.74.0-1 -> 5.74.0-2)
    [2020-09-22T06:45:18+0200] [ALPM] upgraded bluedevil (5.19.5-1 -> 5.19.5-2)
    [2020-09-22T06:45:18+0200] [ALPM] upgraded kdecoration (5.19.5-1 -> 5.19.5-2)
    [2020-09-22T06:45:18+0200] [ALPM] upgraded knewstuff (5.74.0-1 -> 5.74.0-2)
    [2020-09-22T06:45:18+0200] [ALPM] upgraded frameworkintegration (5.74.0-1 -> 5.74.0-2)
    [2020-09-22T06:45:19+0200] [ALPM] upgraded breeze-icons (5.74.0-1 -> 5.74.0-2)
    [2020-09-22T06:45:20+0200] [ALPM] upgraded breeze (5.19.5-1 -> 5.19.5-2)
    [2020-09-22T06:45:20+0200] [ALPM] upgraded breeze-gtk (5.19.5-1 -> 5.19.5-2)
    [2020-09-22T06:45:20+0200] [ALPM] upgraded cups-filters (1.28.1-1 -> 1.28.2-1)
    [2020-09-22T06:45:20+0200] [ALPM] upgraded ddcutil (0.9.5-1 -> 0.9.9-1)
    [2020-09-22T06:45:20+0200] [ALPM] upgraded kxmlrpcclient (1:5.74.0-1 -> 1:5.74.0-2)
    [2020-09-22T06:45:20+0200] [ALPM] upgraded qt5-xmlpatterns (5.15.0-1 -> 5.15.1-1)
    [2020-09-22T06:45:20+0200] [ALPM] upgraded syntax-highlighting (5.74.0-1 -> 5.74.0-2)
    [2020-09-22T06:45:20+0200] [ALPM] upgraded drkonqi (5.19.5-1 -> 5.19.5-2)
    [2020-09-22T06:45:20+0200] [ALPM] upgraded enchant (2:2.2.10-1 -> 2:2.2.11-1)
    [2020-09-22T06:45:20+0200] [ALPM] upgraded farstream (0.2.8-4 -> 0.2.9-1)
    [2020-09-22T06:45:20+0200] [ALPM] upgraded ghostscript (1:9.52-1 -> 1:9.53.1-1)
    [2020-09-22T06:45:21+0200] [ALPM] upgraded glib-networking (2.64.3-2 -> 2.66.0-1)
    [2020-09-22T06:45:21+0200] [ALPM] upgraded groff (1.22.4-5 -> 1.22.4-7)
    [2020-09-22T06:45:21+0200] [ALPM] upgraded gst-libav (1.16.2-1 -> 1.18.0-1)
    [2020-09-22T06:45:21+0200] [ALPM] upgraded gst-plugins-ugly (1.16.2-5 -> 1.18.0-1)
    [2020-09-22T06:45:21+0200] [ALPM] upgraded libx86emu (2.3.1.3-1 -> 3.1.1.3-1)
    [2020-09-22T06:45:21+0200] [ALPM] upgraded hwinfo (21.70-1 -> 21.70-2)
    [2020-09-22T06:45:21+0200] [ALPM] upgraded json-glib (1.4.4-1 -> 1.6.0-1)
    [2020-09-22T06:45:21+0200] [ALPM] upgraded kactivities-stats (5.74.0-1 -> 5.74.0-2)
    [2020-09-22T06:45:21+0200] [ALPM] upgraded kactivitymanagerd (5.19.5-1 -> 5.19.5-2)
    [2020-09-22T06:45:21+0200] [ALPM] upgraded kapidox (5.74.0-1 -> 5.74.0-2)
    [2020-09-22T06:45:21+0200] [ALPM] upgraded kcalendarcore (5.74.0-1 -> 5.74.0-2)
    [2020-09-22T06:45:21+0200] [ALPM] upgraded kcontacts (1:5.74.0-1 -> 1:5.74.0-2)
    [2020-09-22T06:45:21+0200] [ALPM] upgraded kdav (1:5.74.0-1 -> 1:5.74.0-2)
    [2020-09-22T06:45:21+0200] [ALPM] upgraded kpty (5.74.0-1 -> 5.74.0-2)
    [2020-09-22T06:45:22+0200] [ALPM] upgraded kdesu (5.74.0-1 -> 5.74.0-2)
    [2020-09-22T06:45:22+0200] [ALPM] upgraded knotifyconfig (5.74.0-1 -> 5.74.0-2)
    [2020-09-22T06:45:22+0200] [ALPM] upgraded threadweaver (5.74.0-1 -> 5.74.0-2)
    [2020-09-22T06:45:22+0200] [ALPM] upgraded krunner (5.74.0-1 -> 5.74.0-2)
    [2020-09-22T06:45:22+0200] [ALPM] upgraded kparts (5.74.0-1 -> 5.74.0-2)
    [2020-09-22T06:45:22+0200] [ALPM] upgraded kunitconversion (5.74.0-1 -> 5.74.0-2)
    [2020-09-22T06:45:22+0200] [ALPM] upgraded kemoticons (5.74.0-1 -> 5.74.0-2)
    [2020-09-22T06:45:22+0200] [ALPM] upgraded zeromq (4.3.2-1 -> 4.3.3-1)
    [2020-09-22T06:45:23+0200] [ALPM] upgraded kdelibs4support (5.74.0-1 -> 5.74.0-2)
    [2020-09-22T06:45:23+0200] [ALPM] upgraded kwayland-server (5.19.5-1 -> 5.19.5-2)
    [2020-09-22T06:45:23+0200] [ALPM] upgraded kscreenlocker (5.19.5-1 -> 5.19.5-2)
    [2020-09-22T06:45:23+0200] [ALPM] upgraded qt5-virtualkeyboard (5.15.0-1 -> 5.15.1-1)
    [2020-09-22T06:45:23+0200] [ALPM] upgraded qt5-sensors (5.15.0-1 -> 5.15.1-1)
    [2020-09-22T06:45:23+0200] [ALPM] upgraded kwin (5.19.5-1 -> 5.19.5-2)
    [2020-09-22T06:45:23+0200] [ALPM] upgraded qt5-webchannel (5.15.0-1 -> 5.15.1-1)
    [2020-09-22T06:45:23+0200] [ALPM] upgraded qt5-location (5.15.0-1 -> 5.15.1-1)
    [2020-09-22T06:45:24+0200] [ALPM] upgraded qtwebengine (5.15.0-1 -> 5.15.1-1)
    [2020-09-22T06:45:24+0200] [ALPM] upgraded libksysguard (5.19.5-1 -> 5.19.5-2)
    [2020-09-22T06:45:25+0200] [ALPM] upgraded ktexteditor (5.74.0-1 -> 5.74.0-2)
    [2020-09-22T06:45:25+0200] [ALPM] upgraded milou (5.19.5-1 -> 5.19.5-2)
    [2020-09-22T06:45:25+0200] [ALPM] upgraded libkscreen (5.19.5-1 -> 5.19.5-2)
    [2020-09-22T06:45:25+0200] [ALPM] upgraded qt5-translations (5.15.0-1 -> 5.15.1-1)
    [2020-09-22T06:45:25+0200] [ALPM] upgraded qt5-tools (5.15.0-4 -> 5.15.1-1)
    [2020-09-22T06:45:25+0200] [ALPM] upgraded prison (5.74.0-1 -> 5.74.0-2)
    [2020-09-22T06:45:25+0200] [ALPM] upgraded sddm-kcm (1:5.19.5-1 -> 1:5.19.5-2)
    [2020-09-22T06:45:25+0200] [ALPM] upgraded networkmanager-qt (5.74.0-1 -> 5.74.0-2)
    [2020-09-22T06:45:25+0200] [ALPM] upgraded kpeople (5.74.0-1 -> 5.74.0-2)
    [2020-09-22T06:45:25+0200] [ALPM] upgraded kholidays (1:5.74.0-1 -> 1:5.74.0-2)
    [2020-09-22T06:45:25+0200] [ALPM] upgraded kquickcharts (5.74.0-1 -> 5.74.0-2)
    [2020-09-22T06:45:25+0200] [ALPM] upgraded kjs (5.74.0-1 -> 5.74.0-2)
    [2020-09-22T06:45:25+0200] [ALPM] upgraded khtml (5.74.0-1 -> 5.74.0-2)
    [2020-09-22T06:45:25+0200] [ALPM] upgraded kdnssd (5.74.0-1 -> 5.74.0-2)
    [2020-09-22T06:45:25+0200] [ALPM] upgraded libssh (0.9.4-1 -> 0.9.5-1)
    [2020-09-22T06:45:26+0200] [ALPM] upgraded plasma-workspace (5.19.5-2 -> 5.19.5-3)
    [2020-09-22T06:45:27+0200] [ALPM] upgraded kde-cli-tools (5.19.5-1 -> 5.19.5-2)
    [2020-09-22T06:45:27+0200] [ALPM] upgraded kde-gtk-config (5.19.5-1 -> 5.19.5-2)
    [2020-09-22T06:45:27+0200] [ALPM] upgraded kdeconnect-kde (1:20.08.1-1 -> 1:20.08.1-2)
    [2020-09-22T06:45:27+0200] [ALPM] upgraded kross (5.74.0-1 -> 5.74.0-2)
    [2020-09-22T06:45:27+0200] [ALPM] upgraded purpose (5.74.0-1 -> 5.74.0-2)
    [2020-09-22T06:45:27+0200] [ALPM] upgraded kdeplasma-addons (5.19.5-1 -> 5.19.5-2)
    [2020-09-22T06:45:27+0200] [ALPM] upgraded qt5-serialport (5.15.0-1 -> 5.15.1-1)
    [2020-09-22T06:45:27+0200] [ALPM] upgraded qt5-imageformats (5.15.0-1 -> 5.15.1-1)
    [2020-09-22T06:45:28+0200] [ALPM] upgraded qtwebkit-tp (5.212.0.4-6 -> 5.212.0.4-7)
    [2020-09-22T06:45:28+0200] [ALPM] upgraded kdewebkit (5.74.0-1 -> 5.74.0-2)
    [2020-09-22T06:45:28+0200] [ALPM] upgraded kdoctools (5.74.0-1 -> 5.74.0-2)
    [2020-09-22T06:45:28+0200] [ALPM] upgraded khotkeys (5.19.5-1 -> 5.19.5-2)
    [2020-09-22T06:45:28+0200] [ALPM] upgraded kimageformats (5.74.0-1 -> 5.74.0-2)
    [2020-09-22T06:45:28+0200] [ALPM] upgraded kinfocenter (5.19.5-1 -> 5.19.5-2)
    [2020-09-22T06:45:28+0200] [ALPM] upgraded kjsembed (5.74.0-1 -> 5.74.0-2)
    [2020-09-22T06:45:28+0200] [ALPM] upgraded kmediaplayer (5.74.0-1 -> 5.74.0-2)
    [2020-09-22T06:45:29+0200] [ALPM] upgraded kmenuedit (5.19.5-1 -> 5.19.5-2)
    [2020-09-22T06:45:29+0200] [ALPM] upgraded kscreen (5.19.5-1 -> 5.19.5-2)
    [2020-09-22T06:45:29+0200] [ALPM] upgraded ksshaskpass (5.19.5-1 -> 5.19.5-2)
    [2020-09-22T06:45:29+0200] [ALPM] upgraded ksysguard (5.19.5-1 -> 5.19.5-2)
    [2020-09-22T06:45:29+0200] [ALPM] upgraded kwallet-pam (5.19.5-1 -> 5.19.5-2)
    [2020-09-22T06:45:29+0200] [ALPM] upgraded libburn (1.5.2-1 -> 1.5.2-2)
    [2020-09-22T06:45:29+0200] [ALPM] upgraded libetonyek (0.1.9-6 -> 0.1.9-7)
    [2020-09-22T06:45:29+0200] [ALPM] upgraded live-media (2020.05.15-1 -> 2020.08.19-1)
    [2020-09-22T06:45:29+0200] [ALPM] upgraded man-pages (5.08-1 -> 5.08-2)
    [2020-09-22T06:45:29+0200] [ALPM] upgraded masterpdfeditor (1:5.6.42-3 -> 1:5.6.49-1)
    [2020-09-22T06:45:29+0200] [ALPM] upgraded mkinitcpio-busybox (1.31.1-1 -> 1.32.0-1)
    [2020-09-22T06:45:29+0200] [ALPM] upgraded modemmanager-qt (5.74.0-1 -> 5.74.0-2)
    [2020-09-22T06:45:30+0200] [ALPM] upgraded openldap (2.4.52-1 -> 2.4.53-1)
    [2020-09-22T06:45:30+0200] [ALPM] upgraded oxygen (5.19.5-1 -> 5.19.5-2)
    [2020-09-22T06:45:30+0200] [ALPM] upgraded pacman-contrib (1.3.0-1 -> 1.4.0-1)
    [2020-09-22T06:45:30+0200] [ALPM] upgraded polkit-kde-agent-1 (5.19.5-1 -> 5.19.5-2)
    [2020-09-22T06:45:30+0200] [ALPM] upgraded systemsettings (5.19.5-1 -> 5.19.5-2)
    [2020-09-22T06:45:30+0200] [ALPM] upgraded powerdevil (5.19.5-1 -> 5.19.5-3)
    [2020-09-22T06:45:30+0200] [ALPM] upgraded qqc2-desktop-style (5.74.0-1 -> 5.74.0-2)
    [2020-09-22T06:45:30+0200] [ALPM] upgraded plasma-integration (5.19.5-1 -> 5.19.5-2)
    [2020-09-22T06:45:30+0200] [ALPM] upgraded plasma-desktop (5.19.5-1 -> 5.19.5-2)
    [2020-09-22T06:45:31+0200] [ALPM] upgraded plasma-nm (5.19.5-1 -> 5.19.5-2)
    [2020-09-22T06:45:31+0200] [ALPM] upgraded plasma-pa (5.19.5-1 -> 5.19.5-2)
    [2020-09-22T06:45:31+0200] [ALPM] upgraded pyqt5-python3 (5.15.0-2 -> 5.15.1-1)
    [2020-09-22T06:45:31+0200] [ALPM] upgraded pyqtwebengine (5.15.0-2 -> 5.15.1-1)
    [2020-09-22T06:45:31+0200] [ALPM] upgraded qt5-connectivity (5.15.0-1 -> 5.15.1-1)
    [2020-09-22T06:45:31+0200] [ALPM] upgraded qt5-networkauth (5.15.0-1 -> 5.15.1-1)
    [2020-09-22T06:45:31+0200] [ALPM] upgraded vamp-plugin-sdk (2.7.1-1 -> 2.10.0-1)
    [2020-09-22T06:45:31+0200] [ALPM] upgraded rubberband (1.8.2-1 -> 1.9.0-1)
    [2020-09-22T06:45:31+0200] [ALPM] upgraded syndication (1:5.74.0-1 -> 1:5.74.0-2)
    [2020-09-22T06:45:31+0200] [ALPM] upgraded telepathy-mission-control (5.16.5-1 -> 5.16.6-1)
    [2020-09-22T06:45:31+0200] [ALPM] upgraded ttf-raleway (1-7 -> 4.101-1)
    [2020-09-22T06:45:49+0200] [ALPM-SCRIPTLET] Updating font cache... done.
    [2020-09-22T06:45:52+0200] [ALPM] upgraded vim (8.2.1382-1 -> 8.2.1634-1)
    [2020-09-22T06:45:52+0200] [ALPM] upgraded xf86-video-vesa (2.4.0-2 -> 2.5.0-1)
    [2020-09-22T06:45:52+0200] [ALPM] upgraded youtube-dl (2020.09.06-1 -> 2020.09.14-1)
    [2020-09-22T06:45:52+0200] [ALPM] transaction completed
    [2020-09-22T06:45:52+0200] [ALPM] running '99-linux.hook'...
    [2020-09-22T06:45:53+0200] [ALPM-SCRIPTLET] ==> Building image from preset: /etc/mkinitcpio.d/linux.preset: 'default'
    [2020-09-22T06:45:53+0200] [ALPM-SCRIPTLET]   -> -k /boot/vmlinuz-linux -c /etc/mkinitcpio.conf -g /boot/initramfs-linux.img
    [2020-09-22T06:45:54+0200] [ALPM-SCRIPTLET] ==> Starting build: 5.7.19-1
    [2020-09-22T06:45:54+0200] [ALPM-SCRIPTLET]   -> Running build hook: [base]
    [2020-09-22T06:45:55+0200] [ALPM-SCRIPTLET]   -> Running build hook: [udev]
    [2020-09-22T06:45:57+0200] [ALPM-SCRIPTLET]   -> Running build hook: [autodetect]
    [2020-09-22T06:45:58+0200] [ALPM-SCRIPTLET]   -> Running build hook: [modconf]
    [2020-09-22T06:45:58+0200] [ALPM-SCRIPTLET]   -> Running build hook: [block]
    [2020-09-22T06:46:09+0200] [ALPM-SCRIPTLET]   -> Running build hook: [keyboard]
    [2020-09-22T06:46:10+0200] [ALPM-SCRIPTLET]   -> Running build hook: [keymap]
    [2020-09-22T06:46:10+0200] [ALPM-SCRIPTLET]   -> Running build hook: [resume]
    [2020-09-22T06:46:11+0200] [ALPM-SCRIPTLET]   -> Running build hook: [filesystems]
    [2020-09-22T06:46:11+0200] [ALPM-SCRIPTLET]   -> Running build hook: [fsck]
    [2020-09-22T06:46:11+0200] [ALPM-SCRIPTLET] ==> Generating module dependencies
    [2020-09-22T06:46:12+0200] [ALPM-SCRIPTLET] ==> Creating gzip-compressed initcpio image: /boot/initramfs-linux.img
    [2020-09-22T06:46:14+0200] [ALPM-SCRIPTLET] ==> Image generation successful
    [2020-09-22T06:46:14+0200] [ALPM-SCRIPTLET] ==> Building image from preset: /etc/mkinitcpio.d/linux.preset: 'fallback'
    [2020-09-22T06:46:14+0200] [ALPM-SCRIPTLET]   -> -k /boot/vmlinuz-linux -c /etc/mkinitcpio.conf -g /boot/initramfs-linux-fallback.img -S autodetect
    [2020-09-22T06:46:14+0200] [ALPM-SCRIPTLET] ==> Starting build: 5.7.19-1
    [2020-09-22T06:46:14+0200] [ALPM-SCRIPTLET]   -> Running build hook: [base]
    [2020-09-22T06:46:14+0200] [ALPM-SCRIPTLET]   -> Running build hook: [udev]
    [2020-09-22T06:46:15+0200] [ALPM-SCRIPTLET]   -> Running build hook: [modconf]
    [2020-09-22T06:46:15+0200] [ALPM-SCRIPTLET]   -> Running build hook: [block]
    [2020-09-22T06:46:24+0200] [ALPM-SCRIPTLET] ==> WARNING: Possibly missing firmware for module: wd719x
    [2020-09-22T06:46:26+0200] [ALPM-SCRIPTLET] ==> WARNING: Possibly missing firmware for module: aic94xx
    [2020-09-22T06:46:45+0200] [ALPM-SCRIPTLET]   -> Running build hook: [keyboard]
    [2020-09-22T06:46:47+0200] [ALPM-SCRIPTLET]   -> Running build hook: [keymap]
    [2020-09-22T06:46:47+0200] [ALPM-SCRIPTLET]   -> Running build hook: [resume]
    [2020-09-22T06:46:47+0200] [ALPM-SCRIPTLET]   -> Running build hook: [filesystems]
    [2020-09-22T06:46:49+0200] [ALPM-SCRIPTLET]   -> Running build hook: [fsck]
    [2020-09-22T06:46:50+0200] [ALPM-SCRIPTLET] ==> Generating module dependencies
    [2020-09-22T06:46:50+0200] [ALPM-SCRIPTLET] ==> Creating gzip-compressed initcpio image: /boot/initramfs-linux-fallback.img
    [2020-09-22T06:46:56+0200] [ALPM-SCRIPTLET] ==> Image generation successful
    [2020-09-22T06:46:56+0200] [ALPM] running 'fc-cache-install.hook'...
    [2020-09-22T06:46:58+0200] [ALPM] running 'gdk-pixbuf-query-loaders.hook'...
    [2020-09-22T06:47:00+0200] [ALPM] running 'gio-querymodules.hook'...
    [2020-09-22T06:47:00+0200] [ALPM] running 'glib-compile-schemes.hook'...
    [2020-09-22T06:47:00+0200] [ALPM-SCRIPTLET] Warning: Schema ?org.freedesktop.Telepathy.Logger? has path ?/apps/telepathy-logger/?.  Paths starting with ?/apps/?, ?/desktop/? or ?/system/? are deprecated.
    [2020-09-22T06:47:01+0200] [ALPM-SCRIPTLET] Warning: Schema ?org.gnome.system.locale? has path ?/system/locale/?.  Paths starting with ?/apps/?, ?/desktop/? or ?/system/? are deprecated.
    [2020-09-22T06:47:01+0200] [ALPM-SCRIPTLET] Warning: Schema ?org.gnome.system.proxy? has path ?/system/proxy/?.  Paths starting with ?/apps/?, ?/desktop/? or ?/system/? are deprecated.
    [2020-09-22T06:47:01+0200] [ALPM-SCRIPTLET] Warning: Schema ?org.gnome.system.proxy.http? has path ?/system/proxy/http/?.  Paths starting with ?/apps/?, ?/desktop/? or ?/system/? are deprecated.
    [2020-09-22T06:47:01+0200] [ALPM-SCRIPTLET] Warning: Schema ?org.gnome.system.proxy.https? has path ?/system/proxy/https/?.  Paths starting with ?/apps/?, ?/desktop/? or ?/system/? are deprecated.
    [2020-09-22T06:47:01+0200] [ALPM-SCRIPTLET] Warning: Schema ?org.gnome.system.proxy.ftp? has path ?/system/proxy/ftp/?.  Paths starting with ?/apps/?, ?/desktop/? or ?/system/? are deprecated.
    [2020-09-22T06:47:01+0200] [ALPM-SCRIPTLET] Warning: Schema ?org.gnome.system.proxy.socks? has path ?/system/proxy/socks/?.  Paths starting with ?/apps/?, ?/desktop/? or ?/system/? are deprecated.
    [2020-09-22T06:47:01+0200] [ALPM] running 'gtk-update-icon-cache.hook'...
    [2020-09-22T06:47:05+0200] [ALPM] running 'systemd-tmpfiles.hook'...
    [2020-09-22T06:47:05+0200] [ALPM] running 'texinfo-install.hook'...
    [2020-09-22T06:47:06+0200] [ALPM] running 'update-desktop-database.hook'...
    [2020-09-22T06:47:06+0200] [ALPM] running 'update-mime-database.hook'...
    [2020-09-23T07:52:14+0200] [PACMAN] Running 'pacman -Syu'
    [2020-09-23T07:52:15+0200] [PACMAN] synchronizing package lists
    [2020-09-23T07:52:15+0200] [PACMAN] starting full system upgrade

    I'm not able to read the issue fully from the first post, but you have issues with changes you have done to dolphin (faulty encryption setup?), see part of the errors from the journalctl log:

    sep 23 07:49:40 <HOSTNAME> dolphin[2563]: Couldn't start kuiserver from org.kde.kuiserver.service: QDBusError("org.freedesktop.DBus.Error.ServiceUnknown", "The name org.kde.kuiserver was not provided by any .service files")

      demm
      I have made no changes to dolphin.
      Resume of first post: Updated yesterday without errors. I have no taskbar since I booted this morning. Only one common desktop with laptop and additional display, no icons nor taskbar. Added task launcher plasmoid to work.
      Desktop on secondary monitor does not answer to mouse. Desktop on laptop answers to mouse. Currently the secondary monitor as main display and laptop's as secondary. I swapped them but no changes.
      Still searching for similar cases in internet.

      As the journal shows, there are many errors, leading to the kuiserver failing to load, thus no proper Plasma is loaded.
      Dolphin shows many errors related to inotify_add, example:

      sep 23 06:54:59 <HOSTNAME> dolphin[721]: inotify_add_watch(/run/sudo) failed: (Permission denied)

      leading to the kuiserver failure.
      If you don't use any encryption, then make sure to test with a new, clean user, could very well that one of your settings/themes/plasmoid is not ready for new Qt.

      I tried adding a new user. At first, everything went ok (2 desktops, taskbar...), but when booting today and entering the new user it had the same problem as the old one (no taskbar, one desktop...).
      I will wait a time while saving configurations, mails and data, and then I will reinstall.
      Thank you.

      If it is an issue as bvbfan posted, can you switch to using one monitor for now? I have been subscribed to these bug reports a while now, expect a fix soon. KaOS will use the needed patch right away when they publish it. Reinstalling is no use, if you are dealing with the above bug.

        demm
        Thank for your help.
        I will wait a fix to the bug. I am managing to work in the current situation.
        In fact, now I'm using both monitors with limitations but I can live with it :-)
        Hope for a quick fix

        Any improvement when running kquitapp5 plasmashell && plasmashell once the system has fully booted up?

        Running "kquitapp5 plasmashell && plasmashell" works perfect.
        It recovers my initial configuration of destop. Minor adjustments are needed (some icons lost).
        Until official fix to bug, this solution works great.
        Thank you very much Demm

        • demm replied to this.

          jotade70 @raul338
          Can both of you test patched qt5-base? Patch used is from this bug report:
          https://bugreports.qt.io/browse/QTBUG-86604

          sudo pacman -U http://kaosx.tk/repo/build/qt5-base-5.15.1-2-x86_64.pkg.tar.zst

          Since the patch is not approved yet, this version won't move from the build repo, until it is tested as fixing the multi screen issue.

            demm
            I have installed. After reboot I reconfigured the monitor layout and wallpapers again. The config was kept after 3 reboots.

            I think this fix is working

            Hello Demm.
            The patch does not work for me. The system behave just like at the beginning.
            I keep using the command you listed-

            One more rebuild for qt5-base is up, this time with the change that started this issue reverted:

            sudo pacman -U http://kaosx.tk/repo/build/qt5-base-5.15.1-3-x86_64.pkg.tar.zst

              demm
              Hello Demm.
              With the last patch I have recovered the original functionality.
              Everything seems to work OK after 2 reboots.
              Thank you.