On Ubuntu 20.04 if you want use 3rd party desktop app you need to disable builtin desktop functionality in gnome-flashback. You can do that with:
gsettings set org.gnome.gnome-flashback desktop false
That also disables background handling! If 3rd party desktop app does not draw background you can tell gnome-flashback to draw background on root window:
gsettings set org.gnome.gnome-flashback root-background true
On Ubuntu 20.04 if you want use 3rd party desktop app you need to disable builtin desktop functionality in gnome-flashback. You can do that with: gnome-flashback desktop false
gsettings set org.gnome.
That also disables background handling! If 3rd party desktop app does not draw background you can tell gnome-flashback to draw background on root window: gnome-flashback root-background true
gsettings set org.gnome.