I found the cause of the problem.
Because I have Antergos Linux on my laptop, os-prober needs a very long time.
I mounted Antergos on the live system and got partitioner but, I faced a new problem.
When I entered the installation process after partitioning, account settings, Calamares says,
The installer failed to format partition /dev/VG/pv2_root on disk 'VG'.
Create filesystem ext4 on partition ‘/dev/VG/pv2_root’
Job: Delete file system on ‘/dev/VG/pv2_root’
Job: Create file system ‘ext4’ on partition ‘/dev/VG/pv2_root’
Command: mkfs.ext4 -qF /dev/VG/pv2_root
The file /dev/VG/pv2_root does not exist and no size was specified.
/dev/VG vanishes just after starting the installation.
I tried 2 times but Calamares says that for all time.
Do I have to start a new discussion?