This is a wild shot but it may help, I have seen this happen on my system if I had a usb flash drive plugged in while rebooting it would give the same error 22, after removing the usb drive and rebooting grub booted just fine.
-- grub error 22 when trying to boot to hde https://bugs.launchpad.net/bugs/27513 You received this bug notification because you are a member of Ubuntu Bugs, which is a direct subscriber. -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
