Boot failure - after troubleshooting advice

@Flo

This is a follow-on from the previous thread

Although the rear recovery environment worked initially, on a subsequent test restore, the recovery environment failed to load.

I have tried connecting the USB disk to a working system and using gparted to check the partition on the EFI Partition. Unfortunately, this didn’t make any difference.

This is what I’m seeing when the startup fails

Any thoughts?

Thanks
VW

I have found this

https://askubuntu.com/questions/895492/kernel-panic-vfs-cannot-open-root-device-or-unknown-block-error-6

But not sure how I get to a position where I can try this

I’ve also tried playing around with grub

ls (hd0,gpt1)/efi/boot

displays the following files
BOOTX64.efi kernel initrd.cgz grub.cfg

I’ve worked this out

  • the boot partition needs to be fat, rather than fat32
  • use rear mkrescue
  • can only have one disk attached to the system when using rear mkrescue