The problem is in python-qt4. Open Synaptic and look at its origin, in my case 
it was installed locally. I purged n-muench ppa and python-qt4. After that in 
my source list appeared official ubuntu package:
python-qt4:
  Installed: 4.9.1-2ubuntu1
  Candidate:  4.9.1-2ubuntu1
  Version table:
 *** 4.9.1-2ubuntu1 0
        500 http://ua.archive.ubuntu.com/ubuntu/ precise/main amd64 Packages
        100 /var/lib/dpkg/status

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https://bugs.launchpad.net/bugs/993652

Title:
  Calibre crashes on startup after upgrade from 11.10 to 12.04

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