This, along with https://bugs.launchpad.net/gnome-shell/+bug/1876628 occurred because I was using xserver-xorg-input-synaptics, which I gather is no longer supported. Removing this solved the problem.
This, along with https:/ /bugs.launchpad .net/gnome- shell/+ bug/1876628 occurred because I was using xserver- xorg-input- synaptics, which I gather is no longer supported. Removing this solved the problem.