[Bug 2041707] Re: Phased updates block release upgrades

[Julian Andres Klode]

There isn't anything we can do in apt about this sadly. The
implementation that would work correctly for this case (which uses
pinning to implement phasing) breaks the solver in most cases.

Trying to switch candidates in the upgrader code is also not something
I'd be interested in, it would likely again break systems.

Hence reassigning this to ubuntu-release-upgrader to do set the always-
include-phased-updates option (don't remember full name, lookup phased
update in apt discourse post) in apt_pkg.config object.

The pinning based implementation that would solve this particular issue
is also available via a configuration option but it would break the
solver as soon as lunar-updates had a newer version than mantic-updates
for one binary and we try to install another binary of the same source
package.

This means people upgrading releases get phased upgrades installed.
Sadly it's an all or nothing right now, and no phased upgrades doesn't
work in this particular case as it has the same behaviour as the bug.

The real solution involves writing a new solver that doesn't just remove
packages due to unsatisfied dependencies, which is somewhat in progress
(see https://salsa.debian.org/apt-team/solver3 for the concepts) and
then we can be happy.

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https://bugs.launchpad.net/bugs/2041707

Title:
  Phased updates block release upgrades

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

Bug description:
  I updated my Kubuntu 23.04 to 23.10 using do-release-upgrade. It
  finished 100% successfully. But after rebooting into 23.10, I noticed
  that network-manager was kept back to the 23.04 version due to phased
  updates. Specifically:

  # apt policy network-manager

  network-manager:
    Installed: 1.42.4-1ubuntu2
    Candidate: 1.44.2-1ubuntu1.2
    Version table:
       1.44.2-1ubuntu1.2 500 (phased 70%)
          500 http://gr.archive.ubuntu.com/ubuntu mantic-updates/main amd64 Packages
       1.44.2-1ubuntu1 500
          500 http://gr.archive.ubuntu.com/ubuntu mantic/main amd64 Packages
   *** 1.42.4-1ubuntu2 100
          100 /var/lib/dpkg/status

  I.e. the phased version (1.44.2-1ubuntu1.2) prevents me from getting
  the current mantic version (1.44.2-1ubuntu1) and I'm stuck with the
  lunar version (1.42.4-1ubuntu2).

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