http://manpages.ubuntu.com/manpages/bionic/man8/efibootmgr.8.html
Note: efibootmgr requires that the kernel support access to EFI non-volatile variables through /sys/firmware/efi/vars or /sys/firmware/efi/efivars/.
http:// manpages. ubuntu. com/manpages/ bionic/ man8/efibootmgr .8.html
Note: efibootmgr requires that the kernel support access to EFI non-volatile variables through /sys/firmware/ efi/vars or /sys/firmware/ efi/efivars/ .