I saw this issue myself on upgrade; fwiw I think it's much deeper than memtest, I think the actual bug is in os-prober (called by update-grub, called by memtest postinst).
** Package changed: memtest86+ (Ubuntu) => ubuntu -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1123594 Title: lvm snapshots cause memtest86+.post to become defunct To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+bug/1123594/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs