If you want to know how to add entries to the systemd-bootloader, blkid output will be needed.
I have 13 partitions and following operating systems:
Windows 10 on sda5
Ubuntu 14.04.3 on sda9
Ubuntu 15.10 on sda11
Debian Stretch on sda12
Ka-OS Linux on sda13
$ sudo blkid
Password:
/dev/sda1: LABEL="WINRE_DRV" UUID="4EC828D6C828BDD9" TYPE="ntfs" PARTLABEL="Basic data partition" PARTUUID="c58557e8-5e49-42f7-b916-e776b35eccdc"
/dev/sda2: LABEL="SYSTEM_DRV" UUID="F029-85F6" TYPE="vfat" PARTLABEL="EFI system partition" PARTUUID="1e958579-2ad6-408a-942a-021e19fd7532"
/dev/sda3: LABEL="LRS_ESP" UUID="9437-3DB0" TYPE="vfat" PARTLABEL="Basic data partition" PARTUUID="c4bb93c9-d48e-44c8-b2ae-05ff7d9ee8cd"
/dev/sda4: PARTLABEL="Microsoft reserved partition" PARTUUID="66c160a4-c9b0-45f6-80a8-d388495eb3d7"
/dev/sda5: LABEL="Windows8_OS" UUID="7ADC2D11DC2CC969" TYPE="ntfs" PARTLABEL="Basic data partition" PARTUUID="7dff6c55-d7e1-418b-8427-5a6f74dc888f"
/dev/sda6: LABEL="MyData" UUID="9870A77670A75A30" TYPE="ntfs" PARTLABEL="Basic data partition" PARTUUID="3f25d899-f592-476f-a7d9-edeaebeda43b"
/dev/sda7: LABEL="LENOVO" UUID="0402D36602D35AEE" TYPE="ntfs" PARTLABEL="Basic data partition" PARTUUID="e6d2e5f5-77ef-44e3-ac5a-731ef0f30192"
/dev/sda8: LABEL="PBR_DRV" UUID="4A2C3F292C3F1005" TYPE="ntfs" PARTLABEL="Basic data partition" PARTUUID="d758a3d9-bbab-475b-9a0a-48fead5142ff"
/dev/sda9: UUID="1269b53a-8f4f-4beb-a516-c1934c84427a" TYPE="ext4" PARTUUID="b16224c6-c1d0-4518-ba2c-b935ad072ea8"
/dev/sda10: UUID="ea92b2ae-b20b-48c2-a7c5-4198e57a5653" TYPE="swap" PARTUUID="40ef5357-6303-4f98-be5c-618b497c4173"
/dev/sda11: UUID="bbfeb7e9-c30a-4a0e-9302-ecc8e386e026" TYPE="ext4" PARTUUID="9fae2209-641d-444b-8cad-a961882d38f8"
/dev/sda12: LABEL="Debian" UUID="fb0aa46b-ebae-47c2-9e35-d961ecdf122e" TYPE="ext4" PARTLABEL="Debian" PARTUUID="19fa39ef-da70-4665-8186-9e2789a32175"
/dev/sda13: UUID="78286359-59ce-4351-add9-7c5f4e899958" TYPE="xfs" PARTUUID="08858312-edb4-4ce7-a855-08dd818c27a7"