I got a similar error - "It was impossible to install a required package. Please report this as a bug.". Please find the tar file for the dist-upgrade folder. I hope this helps.
** Attachment added: "dist-upgrade.tar" http://launchpadlibrarian.net/19408692/dist-upgrade.tar -- Intrepid Ibex fails via update-manager https://bugs.launchpad.net/bugs/279884 You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs