The error comes from the impossibility for "efibootmgr" to create a new boot UEFI entry # efibootmgr --disk /dev/sda --part 1 --create --label "ubuntu" --loader "\EFI\ubuntu\shmix64.efi" Could not prepare Boot variable: Invalid argument
The error comes from the impossibility for "efibootmgr" to create a new boot UEFI entry shmix64. efi"
# efibootmgr --disk /dev/sda --part 1 --create --label "ubuntu" --loader "\EFI\ubuntu\
Could not prepare Boot variable: Invalid argument