Is there a standard HOWTO I can follow to fix the boot process (to go from a grub / xen.cfg that fails to LUKS decrypt and load unencrypted rootfs)
I am reasonably knowledgeable about Linux. Gaps exist in my knowledge regarding BIOS and UEFI boot processes.
Unfortunately the grub update for the kernel upgrade seems to have messed up the boot process. How do I figure out if it’s installed for BIOS or UEFI mode ?
My data is safe and LUKS encrypted . I can use a live USB to decrypt it, access it and I also have made 2 backup copies.
So with nothing to lose I tried to fix the boot manually from a live USB including creating /etc/default/grub but situation is no better.
Between BIOS / (UEFI) / grub2 / xen / vmlinuz / LUKS / LVM2 , I am lost where the fix might be. Might be grub flags, grub modules, grub defaults, xen cfg, EFI manager etc. Hence my question.