Grub-install: warning: EFI variables are not supported on this system. Install GRUB on the primary disk drive (in our case it is /dev/sda): # grub-install /dev/sdaįile descriptor 4 (/dev/sda1) leaked on vgs invocation. Mount the UEFI partition: # mount /dev/sda1 /mnt/boot/efiīind the directories required by the grub-install and update-grub commands: # for i in /dev /dev/pts /proc /sys /run do mount -B $i /mnt$i doneĬhroot into a broken system: # chroot /mnt Loop0 7:0 0 679.8M 1 loop /run/archiso/sfs/airootfs Mount a “ root” LVM partition: # mount /dev/vgubuntu/root /mntįind out a name of the UEFI system partition (the first partition of a primary disk drive, i.e. The folder will be present if your system is using UEFI.īoot from the rescue media (this can be a special SystemRescue USB stick or a simple live USB with Ubuntu or Linux Mint or any other system with a Linux shell prompt).ĪCTIVE '/dev/vgubuntu/root' inheritĪCTIVE '/dev/vgubuntu/swap_1' inherit UEFI or BIOS? The easiest way to find out if the system has booted in UEFI or BIOS mode is to look for a folder /sys/firmware/efi. I have tested this GRUB reinstallation on Ubuntu Linux, though all of the commands below should work for the other Linux systems as well.Ĭool Tip: How to create a Linux rescue USB stick! Read more → Reinstall GRUB from Live USB

In this note i am describing a particular case of how to repair GRUB by reinstalling it from a live USB if a broken system is configured to boot in UEFI mode and a system’s disk is partitioned to LVM. There are many reasons why you may need to reinstall GRUB: corrupted boot partition GRUB got overridden after Windows installation some unsupported Linux kernel parameters have been set in a GRUB configuration file and the system is not booting anymore but this can’t be fixed from a GRUB menu as it is not showing up, etc.

Install grub on usb from windows