Comment 2 for bug 1683221

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Steve Langasek (vorlon) wrote :

The error in your log is:

Installing for x86_64-efi platform.
grub-install: error: cannot open `/boot/efi/EFI/ubuntu/shimx64.efi': Read-only file system.
Failed: grub-install --target=x86_64-efi

Your ESP must be mounted at /boot/efi and must be mounted read-write in order to upgrade the bootloader.