Broken "Reset All Panels" for Ubuntu 22.10

[David Hedlund]

Background

Window List applet is occasionally unresponsive, see https://ubuntu-mate.community/t/window-list-applet-is-occasionally-unresponsive/23791. Specifically, nothing happens when I am clicking on the icons for the programs that are open.

In Ubuntu 20.04 I could solve this in Window List by clicking on "Reset All Panels" to free them from being locked.

"Window List is part of the mate-panel, part of the wncklet applet which includes window-list, window selector, workspace switcher, and show desktop applets. Named for use of libwnck, which allows interaction with the window manager." - https://github.com/mate-desktop/mate-panel/issues/1365#issuecomment-1519208288

Source code: https://github.com/mate-desktop/mate-panel/blob/master/applets/wncklet/window-list.c

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Bug report starts below this line

$ sudo apt install ubuntu-mate-desktop
* Choose LightDM as X display manager during installation
* Reboot
* Log in
* Mouse right-click on a panel, and click on "Reset All Panels": The panels are removed but not restored, and the CPU never stops working.
* Open another terminal with CTRL+ALT+F1. Sign in with your user and password. run "$ killall mate-session". Hit CTRL+ALT+F7, so log in with LightDM to MATE again.

Also, note that mate-panel 1.27.0-0ubuntu1 was unstable and unstable in other Ubuntu versions:
* ubuntu-18.04.6-desktop-amd64.iso (1.20.1-3ubuntu1): Bug NOT reproduced
* ubuntu-22.04-desktop-amd64.iso (mate-panel 1.26.2-1): Bug reproduced -- solved after sudo apt-get dist-upgrade (see below)
* ubuntu-22.10-desktop-amd64.iso (mate-panel 1.27.0-0ubuntu1): Bug reproduced -- still affected after sudo apt-get dist-upgrade (evaluated 2023-07-14)
* ubuntu-23.04-desktop-amd64.iso (mate-panel 1.27.0-0ubuntu1): Bug NOT reproduced. [Installation note not related to the bug: Same installation procedure as above, in addition, choose "MATE" from LightDM.]

Interestingly, Ubuntu MATE itself is not affected. I could not reproduce the bug by running these version in live mode:
* ubuntu-mate-18.04.5-desktop-amd64.iso (mate-panel 1.20.1-3ubuntu1)
* ubuntu-mate-20.04.6-desktop-amd64.iso (mate-panel 1.24.0-2)
* ubuntu-mate-22.04.2-desktop-amd64.iso (mate-panel 1.26.2-1)
* ubuntu-mate-22.10-desktop-amd64.iso (mate-panel 1.27.0-0ubuntu1)
* ubuntu-mate-23.04-desktop-amd64 (mate-panel 1.27.0-0ubuntu1)

ProblemType: Bug
DistroRelease: Ubuntu 22.04
Package: mate-panel 1.26.2-1
ProcVersionSignature: Ubuntu 5.19.0-40.41~22.04.1-generic 5.19.17
Uname: Linux 5.19.0-40-generic x86_64
ApportVersion: 2.20.11-0ubuntu82.4
Architecture: amd64
CasperMD5CheckResult: pass
CurrentDesktop: MATE
Date: Sat Apr 22 01:38:13 2023
InstallationDate: Installed on 2023-04-17 (4 days ago)
InstallationMedia: Ubuntu 22.04 LTS "Jammy Jellyfish" - Release amd64 (20220419)
SourcePackage: mate-panel
UpgradeStatus: No upgrade log present (probably fresh install)

[David Hedlund (g-public)]

Solved in Ubuntu 22.04 after a recent sudo apt-get dist-upgrade && reboot

I experimented in my VMs to find the responsible package that solved the bug. This did the trick:
sudo apt-get --only-upgrade install libcanberra-gtk3-module

Before the upgrade:
apt-cache show libcanberra-gtk3-module | grep Filename
libcanberra-gtk3-module_0.30-10ubuntu1_amd64.deb

After the upgrade:
apt-cache show libcanberra-gtk3-module | grep Filename
libcanberra-gtk3-module_0.30-10ubuntu1.22.04.1_amd64.deb