[Bug 2043820] Re: Unable to contact snap store on Xubuntu from Jammy to Noble

[Łukasz Zemczak]

Hello Skia, or anyone else affected,

Accepted ubuntu-release-upgrader into noble-proposed. The package will
build now and be available at
https://launchpad.net/ubuntu/+source/ubuntu-release-upgrader/1:24.04.21
in a few hours, and then in the -proposed repository.

Please help us by testing this new package.  See
https://wiki.ubuntu.com/Testing/EnableProposed for documentation on how
to enable and use -proposed.  Your feedback will aid us getting this
update out to other Ubuntu users.

If this package fixes the bug for you, please add a comment to this bug,
mentioning the version of the package you tested, what testing has been
performed on the package and change the tag from verification-needed-
noble to verification-done-noble. If it does not fix the bug for you,
please add a comment stating that, and change the tag to verification-
failed-noble. In either case, without details of your testing we will
not be able to proceed.

Further information regarding the verification process can be found at
https://wiki.ubuntu.com/QATeam/PerformingSRUVerification .  Thank you in
advance for helping!

N.B. The updated package will be released to -updates after the bug(s)
fixed by this package have been verified and the package has been in
-proposed for a minimum of 7 days.

** Changed in: ubuntu-release-upgrader (Ubuntu Noble)
       Status: In Progress => Fix Committed

** Tags added: verification-needed verification-needed-noble

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https://bugs.launchpad.net/bugs/2043820

Title:
  Unable to contact snap store on Xubuntu from Jammy to Noble

Status in firefox package in Ubuntu:
  Confirmed
Status in snapd package in Ubuntu:
  Confirmed
Status in ubuntu-release-upgrader package in Ubuntu:
  Invalid
Status in firefox source package in Noble:
  Confirmed
Status in snapd source package in Noble:
  Confirmed
Status in ubuntu-release-upgrader source package in Noble:
  Fix Committed

Bug description:
  [Impact]

  Upgrades from Jammy to Noble can fail if snap transition packages are
  installed after the new systemd has been unpacked, but before systemd-
  resolved has been unpacked.

  In practice, this manifests on at least Xubuntu upgrades during the
  chromium-browser snap transition.

  [Test Plan]

  Without this fix, the snap store connectivity check will fail when
  installing the chromium-browser snap because systemd-resolved is not
  present, so DNS lookups fail during the connectivity check.

  With the fix in place, the systemd-resolved stub resolver should be
  disabled during the upgrade so that DNS lookups succeed even when
  systemd-resolved is not yet unpacked on the system again.

  So, to test this fix, we should run an upgrade on a Xubuntu 22.04
  system:

  $ do-release-upgrade -d

  And verify that (a) the chromium-browser installation (and snap store
  connectivity check) succeeds, and (b) that the stub resolver is not in
  use during the upgrade.

  $ cat /etc/resolv.conf
  $ cat /run/systemd/resolved.conf.d/dist-upgrade-no-stub-resolver.conf

  [Where problems could occur]

  This patch disables the systemd-resolved stub resolver by writing a drop-in to
  /run/systemd/resolved.conf.d. If there was a mistake in the drop-in, it would not correctly disable the stub resolver.

  [Original Description]

  When running `do-release-upgrade -d` on Jammy Xubuntu, the upgrade
  fails consistently at the `Installing the firefox snap` step.

  This was first detected on Jenkins [1], then reproduced locally with
  `auto-upgrade-testing`, then finally by manually running a `do-
  release-upgrade -d` in a VM.

  [1]: https://platform-qa-jenkins.ps5.ubuntu.com/view/upgrade-
  list/job/upgrade_ubuntu-jammy-noble-xubuntu-amd64_qemu/7/consoleFull
  (Jenkins full log attached)

  ProblemType: Bug
  DistroRelease: Ubuntu 22.04
  Package: ubuntu-release-upgrader-core 1:22.04.17
  ProcVersionSignature: User Name 5.15.0-88.98-generic 5.15.126
  Uname: Linux 5.15.0-88-generic x86_64
  ApportVersion: 2.20.11-0ubuntu82.5
  Architecture: amd64
  CasperMD5CheckResult: unknown
  CrashDB: ubuntu
  CurrentDesktop: XFCE
  Date: Fri Nov 17 18:24:22 2023
  PackageArchitecture: all
  SourcePackage: ubuntu-release-upgrader
  Symptom: ubuntu-release-upgrader
  UpgradeStatus: No upgrade log present (probably fresh install)

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