I had same issue. Try to reinstall with synaptic package manager these two 
packages :
- update-manager
- update-manager-core

Search for update manager, right click both packages, select  Mark for
Reinstallation and click Apply

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https://bugs.launchpad.net/bugs/954344

Title:
  update-manager crashed with ValueError in /usr/lib/python2.7/dist-
  packages/UpdateManager/UpdateManager.py: bad marshal data (unknown
  type code)

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