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

[Olivier Tilloy]

I just tested a focal->jammy upgrade in a regular Ubuntu VM, and this
resulted in the same problem: the firefox deb being removed, seemingly
because the snap was installed.

As a result, the firefox favourite icon disappeared entirely from the
gnome shell dock. This is definitely unwanted behaviour.

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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:
  New

Bug 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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