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

[Julian Andres Klode]

This is caused by these options:

$ grep -R Download-Upgradeable-Packages /etc/apt
/etc/apt/apt.conf.d/10periodic:APT::Periodic::Download-Upgradeable-Packages "1";
/etc/apt/apt.conf.d/20auto-upgrades:APT::Periodic::Download-Upgradeable-Packages "1";

They should be 0 w/ recent APT (which runs unattended-upgrade
--download-only based on the unattended-upgrades interval), but are set
to 1, which means we download all upgradable packages before running u-u
--download-only.

** Also affects: update-notifier (Ubuntu)
   Importance: Undecided
       Status: New

** Also affects: unattended-upgrades (Ubuntu)
   Importance: Undecided
       Status: New

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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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