

I’ve had no issues with Dash to Dock, this looks more like an ArcMenu issue to me based on your screenshot.
In the description for ArcMenu they say:
Requires GMenu package:
- Depending on your distro you may need to install ‘gir1.2-gmenu-3.0’, ‘gnome-menus’, or ‘libgnome-menu-3-0’
Have you got that dependency covered?
What other extensions do you have installed? What versions of Ubuntu and GNOME are you using?
Main character syndrome.