I believe this is an apt bug.  The resolver is working on xserver-xorg-
core Breaks: xserver-xorg-video-6, and runs over its loop limit before
it manages to finish.  This is because it's spending one iteration of
the master resolver loop per provider of xserver-xorg-video-6, when it
could clear them all up in a single iteration.  I believe that this is
an anomaly in apt's handling of Breaks vs. Conflicts, as Conflicts do
appear to cause it to try multiple providers in a single iteration of
the master resolver loop.

I'm working on a patch for this now.

** Package changed: update-manager (Ubuntu) => apt (Ubuntu)

** Changed in: apt (Ubuntu)
   Importance: Undecided => High

** Changed in: apt (Ubuntu)
       Status: New => Triaged

** Changed in: apt (Ubuntu)
     Assignee: (unassigned) => Colin Watson (cjwatson)

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https://bugs.launchpad.net/bugs/922485

Title:
  Lucid Desktop i386 failed to calculate the upgrade to Precise

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