Lets try a fresh install of update-manager then.

1) sudo apt-get autoremove --purge update-manager

2)  sudo find / -name *update-manager* 2>&1 | tee ~/Desktop/find1

Attach the output file from your desktop so I can have a look.  NOTE:
Don't reinstall the update-manager yet.

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https://bugs.launchpad.net/bugs/769817

Title:
  Installation progress dialog not visible

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