setup multiple Debian Linux

Create new entry before setting up new Debian Linux.

add EFI entry

# efibootmgr -c -d /dev/nvmeXn1 -p 1 -w -L debianold -l '\EFI\debian\shimx64.efi'

New, Deban will replace old EFI label debian. You can still boot into old debian using debianold entry.

check current EFI order

$ efibootmgr

delete entry

If you want to delete entry number 5.

# efibootmgr -b 5 -B