In main.log we see the following:

2012-09-20 15:17:22,048 DEBUG failed to SystemUnLock() (E:Not locked)
2012-09-20 15:17:28,673 ERROR Cache can not be locked (E:Could not get lock 
//var/lib/dpkg/lock - open (11: Resource temporarily unavailable),  E:Unable to 
lock the administration directory (//var/lib/dpkg/), is another process using 
it?)

Perhaps the software updater was still doing something?

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https://bugs.launchpad.net/bugs/1052605

Title:
  ERROR:root:getListFromFile: no '/usr/share/update-
  manager/removal_blacklist.cfg' found: exception during Precise to
  Quantal upgrade on amd64+mac

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