UB
Universal Blue•2mo ago
frostcrackle

Dual boot (separate drive)

Hi there, I'm getting 
EFI variables are not supported on this system.
Cannot find Windows boot in EFI, exiting
EFI variables are not supported on this system.
Cannot find Windows boot in EFI, exiting
when trying to use boot-windows. My Windows boot is visible in my bios menu, for reference, but it's not visible in grub.
4 Replies
dreamyuki
dreamyuki•2mo ago
Did you install windows with legacy mode(BIOS)?
frostcrackle
frostcrackleOP•2mo ago
I'm not sure. I've had windows on this system for probably over 5 years now. It was a while ago.
wolfyreload
wolfyreload•2mo ago
You can check it. Run sudo fdisk -l in the terminal on Bazzite. This is what it looks like for me, notice the "EFI System" partition on both Windows drive and Bazzite Drive. If you missing the "EFI System" on either or both then you are using CSM/Legacy boot Bazzite Drive 
Device       Start       End   Sectors   Size Type
/dev/sda1     2048   1230847   1228800   600M EFI System
/dev/sda2  1230848   3327999   2097152     1G Linux extended boot
/dev/sda3  3328000 500117503 496789504 236.9G Linux filesystem
Device       Start       End   Sectors   Size Type
/dev/sda1     2048   1230847   1228800   600M EFI System
/dev/sda2  1230848   3327999   2097152     1G Linux extended boot
/dev/sda3  3328000 500117503 496789504 236.9G Linux filesystem
Windows Drive 
Device         Start       End   Sectors   Size Type
/dev/sdb1       2048    206847    204800   100M EFI System
/dev/sdb2     206848    239615     32768    16M Microsoft reserved
/dev/sdb3     239616 498800639 498561024 237.7G Microsoft basic data
/dev/sdb4  498800640 500115455   1314816   642M Windows recovery environment
Device         Start       End   Sectors   Size Type
/dev/sdb1       2048    206847    204800   100M EFI System
/dev/sdb2     206848    239615     32768    16M Microsoft reserved
/dev/sdb3     239616 498800639 498561024 237.7G Microsoft basic data
/dev/sdb4  498800640 500115455   1314816   642M Windows recovery environment
frostcrackle
frostcrackleOP•2mo ago
Yeah, my bazzite drive is missing EFI System. Windows drive has it. So there's no way to fix that?

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