If you are able to boot to recovery mode, you already have physical access, which always implies root privileges. It's neither necessary nor convenient to ask for a root password (which does not exist anyway in a default Ubuntu installation).
** Visibility changed to: Public ** This bug is no longer flagged as a security issue ** Changed in: Ubuntu Status: Unconfirmed => Rejected -- Root is automaically logged in in the recovery mode. https://launchpad.net/bugs/67760 -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs