No /etc/apt/preferences.

no errors from apt-get upgrade, but apt-get dist-upgrade shows:

Reading package lists... Done
Building dependency tree       
Reading state information... Done
Calculating upgrade... Failed
The following packages have unmet dependencies:
  xulrunner-1.9: Breaks: firefox-3.0 (< 3.0~b3) but 
3.0~b3~cvs20080101t1000+nobinonly-0ubuntu1 is to be installed
E: Error, pkgProblemResolver::Resolve generated breaks, this may be caused by 
held packages.

That seems a reasonable cause for update-manager to fail to calculate an
upgrade, but the error message returned by update-manager doesn't seem
very useful.

-- 
Could not calculate the upgrade
https://bugs.launchpad.net/bugs/192204
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