I upgraded my Ubuntu 18.04 LTS to 20.04 one week ago.
Somehow, I had no settings when I first launched my newly upgraded Ubuntu. I managed to fix that after installing gnome-control-center.
Everything works fine except the "Appearance" settings. I can't change my theme nor enable my dock. The dock is kept hidden for some reason (even though this option is disabled by default). I don't use tweak or any other packages for the dock or the appearance of my windows.
I couldn't find any way to fix it. I tried to remove the user file in dconf or even the .config directory but none of these worked.
Is there anything I could do to fix that? Thanks.
Try by reinstalling the gnome control center:
sudo apt update
sudo apt install gnome-control-center