For those using preseed and having the same problem, a workaround is to fix grub-installer in partman/early_command.
The following line in preseed.cfg will do the trick: d-i partman/early_command string \ sed -i "s/initial_proc_contents=\"$(ls $ROOT/proc)\".*/set +e ; & ; set -e/" /usr/bin/grub-installer ; -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1926528 Title: random failure of grub-installer, working after several retries To manage notifications about this bug go to: https://bugs.launchpad.net/grub-installer/+bug/1926528/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs