The result of this is usually that the user gets frustrated waiting for
updates that never finish installing, so they just turn off the
computer. Then next time there are even more updates, making he problem
worse.
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It isn't clear to me why apt-check is so slow, but from systemctl I can
see that it runs lsb-release to get the release name at least 10 to 20
times per invocation.
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For example look at .var.log.apt.history.log.txt
Many packages take less than a second to install. But in between each
one is a 15 to 20 second delay. That delay is the time during which apt-
check is running.
You can watch this happening by running "watch systemctl status apt-
daily-upgrade"