Thanks for reporting.  Please run:

apport-collect 707392

To gather system info.  Also attach your sources.list:  (Located on
desktop after running following command.)

cat /etc/apt/sources.list > ~/Desktop/Sources

** Changed in: update-manager (Ubuntu)
       Status: New => Incomplete

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https://bugs.launchpad.net/bugs/707392

Title:
  Not possible to upgrade untrusted packages

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