** Description changed:

  I installed Ubuntu and everything worked fine.
- Suddenly, when changing my input language from English to German via 
alt+space, gnome-shell froze. After a reboot I can login, but all I see is a 
cursor on a black background, with gnome-shell and Xorg eating one of my CPU 
cores.
+ Suddenly, when changing my input language from English to German via 
alt+space, gnome-shell froze. After a reboot I can login, but am greeted by a 
cursor on a black background, with gnome-shell and Xorg eating one of my CPU 
cores.
  i3wm starts just fine.
+ 
+ *edit*
+ 
+ After doing the following, gnome-shell will start again:
+ 
+ gsettings list-schemas | xargs -n 1 gsettings reset-recursively
+ systemctl restart gdm
+ 
+ When switching to the German keyboard layout again, it will crash.
+ journalctl is filled with warnings of the following type:
+ 
+ gnome-shell: Window manager warning: Overwriting existing binding of
+ keysym XX with keysym XX (keycode Y)
+ 
  
  ProblemType: Bug
  DistroRelease: Ubuntu 20.10
  Package: gnome-shell 3.38.2-1ubuntu1~20.10.1
  ProcVersionSignature: Ubuntu 5.8.0-45.51-generic 5.8.18
  Uname: Linux 5.8.0-45-generic x86_64
  NonfreeKernelModules: nvidia_modeset nvidia
  ApportVersion: 2.20.11-0ubuntu50.5
  Architecture: amd64
  CasperMD5CheckResult: skip
  Date: Tue Mar 23 14:54:28 2021
  DisplayManager: gdm3
  InstallationDate: Installed on 2021-03-22 (1 days ago)
  InstallationMedia: Ubuntu 20.10 "Groovy Gorilla" - Release amd64 (20201022)
  RelatedPackageVersions: mutter-common 3.38.2-1ubuntu1~20.10.1
  SourcePackage: gnome-shell
  UpgradeStatus: No upgrade log present (probably fresh install)

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https://bugs.launchpad.net/bugs/1920867

Title:
  gnome-shell/Xorg high CPU and log flooded with: Window manager
  warning: Overwriting existing binding of keysym

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