Sorry for missing this. A new version of grub2 has been uploaded to xenial-proposed that fixes the postinst bug, and has now been published.
** Changed in: grub2 (Ubuntu) Status: Confirmed => Fix Released -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1692181 Title: bash syntax error in the postinst script To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/grub2/+bug/1692181/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs