https://bugs.launchpad.net/ubuntu/+source/grub2/+bug/1051624 this bug is quite possibly related and may provide additional information to help sort this out.
Re: post #9 here, There's a series of increasingly-implausible lines of the form: Yes, I a seeing this output also. -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1050774 Title: grub-script-check assert failure: *** glibc detected *** /usr/bin /grub-script-check: double free or corruption (!prev): 0x08210b38 *** To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/grub2/+bug/1050774/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs