I managed to work around the problem by not letting the installation script generate its own random password. See my post titled "Found a solution" here for details:
Error message about one package after each install http://ubuntuforums.org/showthread.php?t=545106 -- post-installation fails when already configured https://bugs.launchpad.net/bugs/106689 You received this bug notification because you are a member of Ubuntu Bugs, which is the bug contact for Ubuntu. -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
