You should not install evolution-experimental because cause conflicts
with evolution-plugin package, that could be the reason. Try to install
all of them except that one.

** Changed in: software-center (Ubuntu)
   Importance: Undecided => Low

** Changed in: software-center (Ubuntu)
       Status: New => Incomplete

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https://bugs.launchpad.net/bugs/683928

Title:
  When using Update Manager, I am stopped from installing the file libpst4 
because the package is untrusted.

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