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

[Balint Reczey]

Regarding the optimal behaviour u-u spends significant amount of CPU time on deciding which are the upgradable packages especially if there are held packages thus there is a tradeoff between network and CPU usage.
I believe both of the options have their benefits, and on a desktop system -updates are more likely to be installed quickly after downloading them thus software-properties seems to be doing the right thing by requesting all packages to be downloaded.

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

Status in apt package in Ubuntu:
  New
Status in software-properties package in Ubuntu:
  New
Status in unattended-upgrades package in Ubuntu:
  Invalid
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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