[Bug 1622510] Re: update-manager popup consumes a lot of CPU

[Brain]

Here is the analysis from Thomas:
https://bugs.launchpad.net/ubuntu/+source/update-manager/+bug/1637180

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https://bugs.launchpad.net/bugs/1622510

Title:
  update-manager popup consumes a lot of CPU

Status in compiz package in Ubuntu:
  Confirmed
Status in update-manager package in Ubuntu:
  Confirmed

Bug description:
  When update-manager has installed updates, the popup asking to reboot
  consumes a lot of CPU via compiz, xorg and update-manager processes,
  but only when the popup is not focused!

  this at least on xenial

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