Comment 7 for bug 674265

I tried to change maverick to natty in sources.list to upgrade.

When updating it says that those dependencies could not be satisfied

libpango1.0-0 network-manager-gnome plymouth xserver-xorg-core

On console:
(if you see weird translation thats because was done with google translate)

The following packages have unmet dependencies:
  dbus: Depends: Upstart-job
         Depends: Upstart (> = 0.6.3-6) but will not be
installed
  HostName: Predepèn: Upstart-job
  logrotate: Depends: cron or
                      Anacron but will not be installed or
                      fcron but will not be installed
  module-init-tools: Depends: Upstart-job
  netbase: Depends: initscripts but will not be installed
            Depends: Upstart-job
            Recommends: ifupdown
  network-manager-gnome: Depends: network-manager (> =
0.8.4 ~) but will not be installed
  procps: Depends: Upstart-job
           Depends: initscripts but will not be installed
  udev: Depends: Upstart-job
  util-linux: Depends: Upstart-job
  x11-common: Depends: Upstart-job
  xserver-xorg-core: Depends: keyboard-configuration but
not be installed
E: Error, pkgProblemResolver:: Resolve generated breaks,
This can be caused by held packages.