I have installed several distros on my PC, Fedora, Antergos, Manjaro Gnome and Sabayon. After installation I cannot start them and I can use only openSUSE plasma. I don’t know why. Please help me. Thank you.
Probe Foreign Os
selected in YaST2 Bootloader Options
Too little information.
If you are booting with UEFI, then you will need to disable secure-boot for this to work.