Comment 4 for bug 1988228

This is the actual grub-installer error:

Aug 30 22:03:24 ubuntu grub-installer: info: architecture: amd64/efi
Aug 30 22:03:24 ubuntu ubiquity: File descriptor 3 (pipe:[37907]) leaked on lvdisplay invocation.
Aug 30 22:03:24 ubuntu ubiquity: Parent PID 38620: /bin/sh
Aug 30 22:03:24 ubuntu ubiquity:
Aug 30 22:03:24 ubuntu ubiquity: Volume group "vda" not found
Aug 30 22:03:24 ubuntu ubiquity:
Aug 30 22:03:24 ubuntu ubiquity:
Aug 30 22:03:24 ubuntu ubiquity: Cannot process volume group vda
Aug 30 22:03:24 ubuntu ubiquity:
Aug 30 22:03:24 ubuntu grub-installer: info: Identified partition label for /dev/vda2: gpt
Aug 30 22:03:24 ubuntu grub-installer: info: Installing grub on '/dev/vda'
Aug 30 22:03:24 ubuntu grub-installer: info: grub-install does not support --no-floppy
Aug 30 22:03:24 ubuntu grub-installer: info: Running chroot /target grub-install --force --target x86_64-efi "/dev/vda"
Aug 30 22:03:24 ubuntu grub-installer: Installing for x86_64-efi platform.
Aug 30 22:03:24 ubuntu grub-installer: grub-install: error: cannot find EFI directory.
Aug 30 22:03:24 ubuntu grub-installer: error: Running 'grub-install --force --target x86_64-efi "/dev/vda"' failed.
Aug 30 22:03:29 ubuntu ubiquity: umount: /target/cdrom: not mounted.
Aug 30 22:03:29 ubuntu plugininstall.py: log-output -t ubiquity umount /target/cdrom