[Bug 1964036] Re: Firefox icon missing from panel following Kubuntu upgrade 20.04->22.04

[Nick Rosbrook]

The autopkgtest failure was resolved with a retry.

I used ubuntu-release-upgrader 1:22.04.15 from jammy-proposed to verify
this fix:

nr at clean-focal-amd64:~$ apt-cache policy firefox
firefox:
  Installed: 107.0+build2-0ubuntu0.20.04.1
  Candidate: 107.0+build2-0ubuntu0.20.04.1
  Version table:
 *** 107.0+build2-0ubuntu0.20.04.1 500
        500 http://archive.ubuntu.com/ubuntu focal-updates/main amd64 Packages
        500 http://security.ubuntu.com/ubuntu focal-security/main amd64 Packages
        100 /var/lib/dpkg/status
     75.0+build3-0ubuntu1 500
        500 http://archive.ubuntu.com/ubuntu focal/main amd64 Packages
nr at clean-focal-amd64:~$ do-release-upgrade --proposed
[ ... ]
nr at clean-focal-amd64:~$ cat /tmp/ubuntu-release-upgrader-u4hfm_j_/DistUpgradeVersion.py 
VERSION = '22.04.15'
nr at clean-focal-amd64:~$ apt-cache policy firefox
firefox:
  Installed: 1:1snap1-0ubuntu2
  Candidate: 1:1snap1-0ubuntu2
  Version table:
 *** 1:1snap1-0ubuntu2 500
        500 http://archive.ubuntu.com/ubuntu jammy/main amd64 Packages
        100 /var/lib/dpkg/status


** Tags removed: verification-needed verification-needed-jammy
** Tags added: verification-done verification-done-jammy

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https://bugs.launchpad.net/bugs/1964036

Title:
  Firefox icon missing from panel following Kubuntu upgrade 20.04->22.04

Status in firefox package in Ubuntu:
  Confirmed
Status in ubuntu-release-upgrader package in Ubuntu:
  Fix Released
Status in firefox source package in Jammy:
  New
Status in ubuntu-release-upgrader source package in Jammy:
  Fix Committed

Bug description:
  [Impact]

  By removing the firefox deb and installing the snap instead, ubuntu-
  release-upgrader is subverting the logic of the firefox transitional
  deb.

  [Test Case]

  Perform an upgrade from focal to jammy:

  $ do-release-upgrade

  On an affected system, the firefox deb will be removed by the upgrade,
  and the snap will be installed instead. On a fixed system, ubuntu-
  release-upgrader will not remove the firefox deb, and the deb will
  handle the transition to the snap.

  [Where problems could occur]

  If the patch was wrong, e.g. JSON syntax error or similar, it could
  mess up the remaining deb2snap entries.

  [Original Description]

  1) lsb_release -rd

  Description:    Ubuntu Jammy Jellyfish (development branch)
  Release:        22.04
  (Kubuntu Jammy live session in QEMU VM)

  2) apt-cache policy ubuntu-release-upgrader-core
  ubuntu-release-upgrader-core:
    Installed: 1:22.04.6

  3) expected

  (upgrade from Kubuntu 20.04.3 -> 22.04. Reboot.)

  * Firefox icon on panel to be intact.
  * Clicked icon launches browser.
  * Icon tooltip/mouse hover to describe application.

  4) happened instead

  * Icon is missing/replaced with a generic icon
  * Icon click produces error notification "Plasma Workspace - preferred://browser"
  * Icon tooltip/mouse hover appears, though is blank.

  Additional info:
  * firefox is still installed, works as expected.
  ---
  ProblemType: Bug
  ApportVersion: 2.20.11-0ubuntu78
  Architecture: amd64
  CasperMD5CheckResult: unknown
  CrashDB: ubuntu
  CurrentDesktop: KDE
  DistroRelease: Ubuntu 22.04
  InstallationDate: Installed on 2022-03-07 (2 days ago)
  InstallationMedia: Kubuntu 20.04.3 LTS "Focal Fossa" - Release amd64 (20210819.1)
  Package: ubuntu-release-upgrader (not installed)
  ProcVersionSignature: Ubuntu 5.15.0-18.18-generic 5.15.12
  Tags:  jammy dist-upgrade
  Uname: Linux 5.15.0-18-generic x86_64
  UpgradeStatus: Upgraded to jammy on 2022-03-07 (2 days ago)
  UserGroups: adm cdrom dip lpadmin lxd plugdev sambashare sudo
  VarLogDistupgradeXorgFixuplog:
   INFO:root:/usr/bin/do-release-upgrade running
   INFO:root:No xorg.conf, exiting
  _MarkForUpload: True

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