[Bug 1925745] Re: Hirsute: Cannot install ubuntu-desktop due to unmet dependencies

[Julian Andres Klode]

This caused a regression in autopkgtest, causing the ubuntu-advantage-
tools failure. We'll have to SRU an autopkgtest that sets always-
include-phased-updates as in https://salsa.debian.org/ci-
team/autopkgtest/-/merge_requests/125

** Tags added: block-proposed-hirsute

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Title:
  Hirsute: Cannot install ubuntu-desktop due to unmet dependencies

Status in apt package in Ubuntu:
  Fix Released
Status in apt source package in Hirsute:
  Fix Committed
Status in apt source package in Impish:
  Fix Released

Bug description:
  [Impact]
  Phased upgrades were only applied to already installed packages, so if we had a source package foo building foo-core and foo-extra, and foo-core=1 was installed, and we tried to install foo-extra, it would fail because it would try to install 0% foo-extra=2 while blocking foo-core as it's "not for us".

  [Test Plan]
  The autopkgtests ensure we don't regress and they kind of check this by checking the policy output to see that "foo-extra=2" above is also not the candidate, but foo-extra=1 is (so installing it alongside foo-core=1 would work fine) but they don't install it, so it might be nice to verify this too:

  Find a package that is phased, but not for us (maybe just setting the
  never-include-phased flag?), install one binary from it from the
  release pocket, and then try to install another from the updates
  pocket.

  At the moment, installing libsystemd-dev would trigger it.

  [Where problems could occur]
  This is a change in behavior when installing new packages that might cause regression in image building tools for example, if those don't use a chroot (chroots being detected).

  Apart from that risk, the change is just removing a flag check inside
  an if, so not much else.

  [Original bug report]

  I'm using the ubuntu-21.04-live-server-amd64 ISO to install my hirsute
  desktop machines so I can automate the installation.

  After installation, I'm trying to install the desktop via "apt install
  ubuntu-desktop".

  This fails with:
  "Some packages could not be installed. This may mean that you have
  requested an impossible situation or if you are using the unstable
  distribution that some required packages have not yet been created
  or been moved out of Incoming.
  The following information may help to resolve the situation:

  The following packages have unmet dependencies:
   ubuntu-release-upgrader-gtk : Depends: ubuntu-release-upgrader-core (= 1:21.04.11) but 1:21.04.10 is to be installed
                                 Depends: python3-distupgrade (= 1:21.04.11) but 1:21.04.10 is to be installed
  E: Unable to correct problems, you have held broken packages."

  "apt policy ubuntu-release-upgrader-core" shows:
  "ubuntu-release-upgrader-core:
    Installed: 1:21.04.10
    Candidate: 1:21.04.10
    Version table:
       1:21.04.11 1 (phased 20%)
          500 http://at.archive.ubuntu.com/ubuntu hirsute-updates/main amd64 Packages
   *** 1:21.04.10 500
          500 http://at.archive.ubuntu.com/ubuntu hirsute/main amd64 Packages
          100 /var/lib/dpkg/status"

  I could not find any information what "phased 20%" means. It's
  obviously a major problem not being able to install the desktop on a
  fresh installation.

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