Had my dock on bottom (+autohide) in Ubuntu 19.04. After upgrade to Ubuntu 19.10 it disappeared and can be found now only in Activities overview.
I can start apps from there and it has all apps that I have added there but can't get it to be in the original place and on desktop, not in Activities.
Tried Settings -> Dock and none of the 3 settings (Auto hide, Icon size, Position) have any effect.
Output $apt policy gnome-shell-extension-ubuntu-dock
*** 67ubuntu19.10.1 500
500 http://archive.ubuntu.com/ubuntu eoan/main amd64 Packages
500 http://archive.ubuntu.com/ubuntu eoan/main i386 Packages
Restarting desktop with "r" does not correct the proble, Dock still in Activities.