crashes trying to open the mouse screen

[jjh]

gnome-control-center crashes on ubuntu 23.04 when trying to open the mouse screen

Steps to reproduce:

1. In GNOME Settings, navigate to the mouse screen. The control center crashes (i.e., the window closes instead of showing the mouse screen).
2. Start GNOME Settings again, e.g., using GNOME Shell or by running the following command from the terminal: `gnome-control-center`. The main window does not show. Instead, the commandline output prints an error message as follows:

Commandline output:

```
gnome-control-center --verbose
21:10:51.6276 GStreamer-Play[32248]: ERROR: GtkGstPlay: 'playbin' element not found, please check your setup
[1] 32248 trace trap (core dumped) gnome-control-center --verbose
```

More observations: Note, this happens reproducably. I just recently upgraded to ubuntu 23.04, which means I am running GNOME 44. I am now unable to start the gnome-control-center. It happens in wayland and xorg sessions. I am using an intel x86 laptop, a lenovo thinkpad x1 carbon.

Workaround: The following workaround allows to start gnome-control-center again, but does not allow to access the mouse panel. In dconf editor, reset `org/gnome/control-center/last-panel'. The control center will then open successfully. I think this indicates that the mouse panel causes gnome-control-center to crash.

Upstream ticket over at GNOME's gitlab project:
https://gitlab.gnome.org/GNOME/gnome-control-center/-/issues/2459

Upstream analysis by Felipe Borges, maintainer of the upstream project:

> The issue seems to be about Ubuntu packaging not including the needed dependencies for the GtkPicture videos we now show in the Mouse panel.
> Could you please file this issue downstream in the Ubuntu bug tracker?
---
ProblemType: Bug
ApportVersion: 2.26.1-0ubuntu2
Architecture: amd64
CasperMD5CheckResult: unknown
CurrentDesktop: ubuntu:GNOME
DistroRelease: Ubuntu 23.04
EcryptfsInUse: Yes
InstallationDate: Installed on 2020-11-15 (892 days ago)
InstallationMedia: Ubuntu 20.04.1 LTS "Focal Fossa" - Release amd64 (20200731)
Package: gnome-control-center 1:44.0-1ubuntu5
PackageArchitecture: amd64
ProcVersionSignature: Ubuntu 6.2.0-20.20-generic 6.2.6
Tags: lunar wayland-session
Uname: Linux 6.2.0-20-generic x86_64
UpgradeStatus: Upgraded to lunar on 2023-04-23 (3 days ago)
UserGroups: adm cdrom dip docker lpadmin lxd plugdev sambashare sudo
_MarkForUpload: True

[Launchpad Janitor (janitor)]

Status changed to 'Confirmed' because the bug affects multiple users.

[Lubomir Brindza (lubomir-brindza)]

Also happens on the "Multitasking" panel.

The last panel setting can also be cleared by running `gsettings reset org.gnome.Settings last-panel`.

[Jeremy Bícha (jbicha)]

Thank you for taking the time to report this bug and helping to make Ubuntu better. Please execute the following command only once, as it will automatically gather debugging information, in a terminal:
apport-collect 2017498

When reporting bugs in the future please use apport by using 'ubuntu-bug' and the name of the package affected. You can learn more about this functionality at https://wiki.ubuntu.com/ReportingBugs.

[jjh (jjh-nospam)]

apport information

[jjh (jjh-nospam)]

apport information

[jjh (jjh-nospam)]

apport information

[Haui (haui111)]

This did it for me: gsettings reset org.gnome.Settings last-panel

Thanks for the suggestion

[Lubomir Brindza (lubomir-brindza)]

This bug seems to have been resolved in the meantime, incidentally (for me, anyway). I haven't checked in a while, but after getting notification of the previous post in the mail, and running an update, I've rechecked and can use both Mouse and Multitasking panels without an issue.

[Sebastien Bacher (seb128)]

Is that still an issue? If so could you get a backtrace as described on https://wiki.ubuntu.com/Backtrace ?

[jjh (jjh-nospam)]

The bug is resolved on my system as well. Running ubuntu 23.04 and GNOME 44.3, gnome-control-center installed via apt with package version 1:44.0-1ubuntu6

[aki sakurai (akisakurai)]

For me, the reason is the gstreamer playback plugin being blacklisted.

To remove it from blacklist, you can run :
sudo rm ~/.cache/gstreamer-1.0/registry*

I have no idea why it was blacklisted in the first place.

[Launchpad Janitor (janitor)]

[Expired for gnome-control-center (Ubuntu) because there has been no activity for 60 days.]