Guake keyboard shortcuts no longer working
Ubuntu 20 / gnome-shell / wayland seems to have (partially?) disabled quake's ability to set global keybindings.
You can manually re-enable them by going into system settings -> devices -> keyboard and scrolling to the bottom and add them by clicking on the + and bind the key to the command line equivalent to do what you want with guake.
The only guake keybinding I've tried changing is the one to open the window.