Nov 30 15:19:14 xubuntu grub-installer[13737]: info: Installing grub on '/dev/sda5'
Nov 30 15:19:14 xubuntu grub-installer[13747]: info: grub-install does not support --no-floppy
Nov 30 15:19:14 xubuntu grub-installer[13748]: info: Running chroot /target grub-install  --force "/dev/sda5"
Nov 30 15:19:14 xubuntu grub-installer[13749]: Installing for x86_64-efi platform.
Nov 30 15:19:16 xubuntu grub-installer[13749]: grub-install: error: cannot open `/boot/efi/EFI/ubuntu/grubx64.efi': Read-only file system.
Nov 30 15:19:16 xubuntu grub-installer[13779]: error: Running 'grub-install  --force "/dev/sda5"' failed.