Grub cannot find the other linux os installed on the hard drive

[zoli62]

If you’d rather use Fedora’s grub and it includes the EndeavorOS startup entry, have you tried this yet?

UEFI Grub and BIOS Grub in parallel

The quick and dirty way to fix the fallback thing is likely to be an incorrect entry by the grub os-prober from the other system. If you change the line: initrd /boot/amd-ucode.img (obviously if Intel powered, it will read /boot/intel-ucode.img) to initrd /boot/amd-ucode.img /boot/initramfs-linux.img in the file /boot/grub.cfg it will probably ‘fix’ the problem. The reason this is ‘dirty’ is that the file WILL be overwritten on every grub update, and need to be ‘fixed’ again. What I would…