[Bug 1825812] Re: Daily apt update timer downloads all dist-upgradable packages

[Steve Langasek]

I somehow thought that this was intentional behavior, that we would
download all of the packages so that they would be available to apply
quickly, even if we would only automatically install the security
updates.

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https://bugs.launchpad.net/bugs/1825812

Title:
  Daily apt update timer downloads all dist-upgradable packages

Status in apt package in Ubuntu:
  New
Status in unattended-upgrades package in Ubuntu:
  New
Status in update-notifier package in Ubuntu:
  New

Bug description:
  [Impact]
  apt-daily.service accidentally runs apt-get -d dist-upgrade after the first time it runs unattended-upgrades -d due to the latter reusing the stamp of the former.

  This means that machines download all packages that can be dist-
  upgraded rather than just the security updates unattended-upgrades
  will install; which means they might be wasting bandwidth.

  [Test case]
  TODO

  [Regression potential]
  TODO

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