Nov 11, 2019 · Step 4: Update GRUB. After entering your Linux OS, reinstall GRUB and update it. Open the terminal and enter following commands: sudo grub-install /dev/sdXY sudo update-grub Here, X is disk number and Y is partition number of EFI partition. If you don’t know which partition is an EFI partition, use Disks or GParted to check.
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