[Bug 2134446] Re: Upgrade to Ubuntu 26.04 LTS set invalid channel for seeded snaps

[Nick Rosbrook]

Uffda, thanks for the bug. I will fix this soon.

** Changed in: ubuntu-release-upgrader (Ubuntu)
       Status: New => Triaged

** Changed in: ubuntu-release-upgrader (Ubuntu)
     Assignee: (unassigned) => Nick Rosbrook (enr0n)

** Changed in: ubuntu-release-upgrader (Ubuntu)
    Milestone: None => ubuntu-26.04

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https://bugs.launchpad.net/bugs/2134446

Title:
  Upgrade to Ubuntu 26.04 LTS set invalid channel for seeded snaps

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

Bug description:
  Test Case
  =========
  Install Ubuntu Desktop 25.10
  Log in. Install all updates. Restart.
  Log in. Run update-manager -d. Follow the prompts to upgrade to Ubuntu 26.04 LTS.

  What Happens
  ============
  All seeded snaps are set to track "stable/ubuntu-26.04 LTS". That is an invalid target.

  (excerpt)
  $ snap info firefox
  name:      firefox
  summary:   Mozilla Firefox web browser
  description: |
    Firefox is a powerful, extensible web browser with support for modern web
    application technologies.
  tracking:     latest/stable/ubuntu-26.04 LTS

  I only noticed this issue because I wondered why I still had Firefox
  144 on an Ubuntu 26.04 LTS devel instance, even though Firefox 146 is
  scheduled for release tomorrow.

  Nothing in the system warns about this unless you happen to run a
  command like this manually:

  $ snap refresh firefox
  error: requested a non-existing branch on latest/stable for snap "firefox": ubuntu-26.04 LTS

  I am setting the severity to Critical because this prevents nearly
  everyone using Firefox from receiving security updates. (Mitigated
  because relatively few people are running Ubuntu 26.04 LTS now, but it
  is being used by developers and very early adopters.) I did not check
  if upgrades to Ubuntu 24.04 LTS are affected, but I hope we would have
  seen bug reports if that were true.

  Workaround
  ==========
  I requested a simple command to fix this in LP: #2134444

  Otherwise, it's tedious to update all your affected seeded snaps manually. You can find a list at
  https://cdimage.ubuntu.com/daily-live/current/resolute-desktop-amd64.manifest
  If you're using a different flavor of Ubuntu, use the appropriate manifest instead:
  https://cdimage.ubuntu.com/edubuntu/daily-live/current/resolute-desktop-amd64.manifest

  sudo snap refresh --amend --channel=1/stable/ubuntu-26.04 desktop-security-center
  sudo snap refresh --channel=stable/ubuntu-26.04 firefox

  Do that for all the seeded snaps to match what you see at the bottom
  of the manifest file. Thunderbird isn't installed if you didn't choose
  the full install option for Ubuntu Desktop.

  ProblemType: Bug
  DistroRelease: Ubuntu 26.04
  Package: ubuntu-release-upgrader-core 1:26.04.2
  ProcVersionSignature: Ubuntu 6.17.0-7.7-generic 6.17.2
  Uname: Linux 6.17.0-7-generic x86_64
  ApportVersion: 2.33.1-0ubuntu3
  Architecture: amd64
  CasperMD5CheckResult: pass
  CrashDB: ubuntu
  CrashReports: 644:0:110:0:2025-12-08 18:02:11.640000000 -0500:2025-12-08 22:49:37.929000000 -0500:/var/crash/kdump_lock
  CurrentDesktop: ubuntu:GNOME
  Date: Mon Dec  8 23:02:49 2025
  InstallationDate: Installed on 2025-10-24 (45 days ago)
  InstallationMedia: Ubuntu 25.10 "Questing Quokka" - Beta amd64 (20250917.2)
  PackageArchitecture: all
  ProcEnviron:
   LANG=en_US.UTF-8
   PATH=(custom, no user)
   SHELL=/bin/bash
   TERM=xterm-256color
   XDG_RUNTIME_DIR=<set>
  SourcePackage: ubuntu-release-upgrader
  Symptom: ubuntu-release-upgrader
  UpgradeStatus: Upgraded to resolute on 2025-12-09 (0 days ago)
  VarLogDistupgradeTermlog:

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