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

[Nick Rosbrook]

> Did you rule out the option of early-install'in systemd-resolved
during the upgrade?

My assessment was that this would be too complicated in practice. While
there are many mechanisms in the upgrader to *mark* additional packages
for installation, there is no good way to say "install this package
right now" early in the upgrade. Nor is there a way to change the
ordering of packages installed during the upgrade.

The advantage of disabling the stub resolver is that (a) it leaves the
apt cache and upgrade calculation alone, and (b) it's a supported mode
for systemd-resolved anyways. We're not doing anything tricky; just
transiently setting `DNSStubListener=no`.

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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:
  Triaged

Bug 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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