apt-check is part of update-notifier. That said, this does not seem to
be hooked into apt, at least in 18.04. Does
grep -R apt-check /etc
tell you anything?
** Package changed: apt (Ubuntu) => update-notifier (Ubuntu)
** Changed in: update-notifier (Ubuntu)
Status: New => Incomplete
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https://bugs.launchpad.net/bugs/1781772
Title:
apt-get update runs apt-check at nice 19
Status in update-notifier package in Ubuntu:
Incomplete
Bug description:
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
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