[Bug 2045784] [NEW] Set APT::Get::Always-Include-Phased-Updates in ubuntu-release-upgrader

[Julian Andres Klode]

Public bug reported:

We had a bunch of mysterious update failures and talking about it I
realized this might be caused by phased updates. I thought we had set
"APT::Get::Always-Include-Phased-Updates" to always make the u-r-u pick
up upgrades that are still phasing, but looking through the code I don't
see it.

Without the flag, APT will keep back the package from upgrading and keep
it on the installed version from the previous release, which is not what
we want. It may then keep back stuff depending on the new version and
eventually keep back entire subtrees of the upgrade.


So basically just set

apt_pkg.config["APT::Get::Always-Include-Phased-Updates"] = "yes"

To make APT install phased upgrades during release upgrades.


Sadly APT is not able to just switch to another version at this point, maybe one day launchpad keeps old updates around while phasing and we can then rework the apt phasing to use those, but it also needs a different solver that can handle ordered lists of versions rather than one candidate version.

** Affects: ubuntu-release-upgrader (Ubuntu)
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/2045784

Title:
  Set  APT::Get::Always-Include-Phased-Updates in ubuntu-release-
  upgrader

Status in ubuntu-release-upgrader package in Ubuntu:
  New

Bug description:
  We had a bunch of mysterious update failures and talking about it I
  realized this might be caused by phased updates. I thought we had set
  "APT::Get::Always-Include-Phased-Updates" to always make the u-r-u
  pick up upgrades that are still phasing, but looking through the code
  I don't see it.

  Without the flag, APT will keep back the package from upgrading and
  keep it on the installed version from the previous release, which is
  not what we want. It may then keep back stuff depending on the new
  version and eventually keep back entire subtrees of the upgrade.

  
  So basically just set

  apt_pkg.config["APT::Get::Always-Include-Phased-Updates"] = "yes"

  To make APT install phased upgrades during release upgrades.

  
  Sadly APT is not able to just switch to another version at this point, maybe one day launchpad keeps old updates around while phasing and we can then rework the apt phasing to use those, but it also needs a different solver that can handle ordered lists of versions rather than one candidate version.

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