Not having /boot mounted is not a supported configuration. Without it, besides not being able to update grubenv, it also can't update grub.cfg, or install a new version of grub. There isn't anything that can be done about that other than to keep /boot mounted.
** Changed in: grub2 (Ubuntu) Status: New => Invalid -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1594903 Title: Ubuntu does not reset grubenv's recordfail To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/grub2/+bug/1594903/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs