Can confirm this happens on "apt-get update" command on Kubuntu 16.04.
If I have more processes open when I try to run this it makes my
computer unresponsive, not only because the processor is at 100% which
is bad enough, but because it will start digging into swap, and I have
16GB of RAM. Terrible bug indeed!

Interestingly enough if I run "apt-get install update-notifier" it would
appear as if it where not installed so it's all the more frustrating.

For those that have problems with their computer being unusable from
time to time there is a file in cron.daily and cron.weekly that starts
this process automatically which you can comment out. Or if you want to
disable it completely you can just:

mv /usr/lib/update-notifier/apt-check 
/usr/lib/update-notifier/apt-check.disabled
touch apt-check
chmod 777 $_

I'm not really sure what the above would break but it's better than
having the system unusable in my opinion.

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https://bugs.launchpad.net/bugs/746508

Title:
  apt-check uses too much resources (starts too many processes)

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