Public bug reported:

Running 16.04, after installing updates, and leaving the confirmation
dialog box open for some while in the background, I notice the laptop is
hot, with fans running.

"top" shows the compiz process consuming high CPU.

Closing the update-manager window causes the CPU load to drop
immediately.

Strace suggests the update manager process is chatting with the X server
- possibly repainting continuously?

** Affects: update-manager (Ubuntu)
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/1582839

Title:
  Update manager pegs compiz at high CPU load after installing updates

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