[Bug 1781772] [NEW] apt-get update runs apt-check at nice 19

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When I try to install a new package on one of my compute nodes which are
running one nice-0 task per hyperthread, there is an extremely long
delay at the end of installation as apt-check is running at nice 19 and
getting almost no cycles.  Renicing it to -5 resolves the problem at
once.

It is not reasonable to make a human who you know to be sitting at the
console wait for a task running at nice 19 on a busy machine to finish,
especially if you're holding the dpkg lock the whole time.

This is with 16.04.4

** Affects: apt (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: bot-comment
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apt-get update runs apt-check at nice 19
https://bugs.launchpad.net/bugs/1781772
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