Restore EFI Boot
Boot a Ubuntu USB (Esc,F12 or F8 on boot)
Select "Try Ubuntu"
In Terminal
Determine whether your computer is in EFI or Legacy mode first
ls /sys/firmware/efi must exist
sudo fdisk -l
gparted
Created a new partition at the beginning of the disk
Format the partition as a FAT partition and must set to type EFI
sudo mount /dev/sda2 /mnt
sudo mount /dev/sda1 /mnt/boot/efi
for i in /dev /dev/pts /proc /sys /run; do sudo mount -B $i /mnt$i; done # Prepare chroot environment
sudo chroot /mnt # activate chroot and set /mnt as root
grub-install /dev/sda # reinstall grub:
sudo update-grub
# make sure /etc/fstab and correct UUID
# eg UUID=D303-EB8B /boot/efi vfat umask=0077 0 1
sudo blkid /dev/sda1
sudo update-grub
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Glenn Lyons VK4PK
glenn@LyonsComputer.com.au
Ver:gnl20220603 - pre published v0.9