sudo blkid ### tells the partitions sudo mount /dev/sda7 /mnt ## if your linux is on /dev/sda7 sudo mount /dev/sda2 /mnt/boot ## if the EFI-partition is /dev/sda2 sudo mount --bind /dev /mnt/dev sudo mount --bind /sys /mnt/sys sudo mount --bind /proc /mnt/proc sudo chroot /mnt nano /etc/resolv.conf ... the contents nameserver 8.8.8.8 .... save and quit Ctrl o Ctrl x apt-get update apt-get install grub-efi-amd64 mount /dev/sda2 /boot/efi ### if the efi partition is /dev/sda2 apt-get install --reinstall grub-efi update-grub exit sudo umount /mnt/dev sudo umount /mnt/sys sudo umount /mnt/proc sudo umount /mnt/boot sudo umount /mnt