I'm sorry,
Indeed, this seems exatcly bug 1877774, with SIGSEGV occuring on 
st_theme_ensure_background.
In spite of that, I couldn't figure out if the bug has been solved since my 
system is already up-to-date.

Thank you for your attention and fast response,


‐‐‐‐‐‐‐ Original Message ‐‐‐‐‐‐‐
On Tuesday, 9 June 2020 05:32, Daniel van Vugt <1882...@bugs.launchpad.net> 
wrote:

> Note this is probably bug 1877774.
>
> -----------------------------------
>
> You received this bug notification because you are subscribed to the bug
> report.
> https://bugs.launchpad.net/bugs/1882585
>
> Title:
> gnome crashes when trying to lock session
>
> Status in gnome-shell package in Ubuntu:
> Invalid
>
> Bug description:
> When trying to lock session, either through key combination or clicking 
> 'lock' in the top right menu, gnome unexpectedly freezes. During the time 
> it's freezed I can move the mouse freely, but everything stops (even the 
> clock). After some time it seems to restart because it flashes and everything 
> goes back to normal. After the crash if I try to relock it again it works, 
> but if I try after that the cycle repeats.
> Sometimes after the crash a crash report window launches accusing a SIGSEGV 
> in gnome-shell.
> Looking at Logs I can see that the main process was exited and that the core 
> was dumped.
> Note that at the time it freezes gnome unexpectedly switches the active 
> window.
>
> I'm running Ubuntu 20.04 LTS with gnome-shell version
> 3.36.2-1ubuntu1~20.04.1
>
> ProblemType: Bug
> DistroRelease: Ubuntu 20.04
> Package: gnome-shell 3.36.2-1ubuntu1~20.04.1
> ProcVersionSignature: Ubuntu 5.4.0-33.37-generic 5.4.34
> Uname: Linux 5.4.0-33-generic x86_64
> NonfreeKernelModules: nvidia_modeset nvidia
> ApportVersion: 2.20.11-0ubuntu27.2
> Architecture: amd64
> CasperMD5CheckResult: skip
> CurrentDesktop: ubuntu:GNOME
> Date: Mon Jun 8 17:49:56 2020
> DisplayManager: gdm3
> InstallationDate: Installed on 2020-05-06 (33 days ago)
> InstallationMedia: Ubuntu 20.04 LTS "Focal Fossa" - Release amd64 (20200423)
> RelatedPackageVersions: mutter-common 3.36.2-1ubuntu1~20.04.1
> SourcePackage: gnome-shell
> UpgradeStatus: No upgrade log present (probably fresh install)
>
> To manage notifications about this bug go to:
> https://bugs.launchpad.net/ubuntu/+source/gnome-shell/+bug/1882585/+subscriptions

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https://bugs.launchpad.net/bugs/1882585

Title:
  gnome crashes when trying to lock session

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