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

[Olivier Tilloy]

Richard, if this is the same problem being investigated here, then what
would explain the icon disappearing is the firefox deb being
uninstalled. You can check /var/log/apt/history.log* for info on when
and why that happened. Note that this shouldn't/wouldn't have happened
if you launched firefox at least once, because the launcher script from
the transitional deb has some logic to rewrite the target of the
favourite to point to the snap instead of the deb.

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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:
  Confirmed

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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