I have an Odroid running Ubuntu and Kstars/EKOS as a proposed replacement TCS. I have been quite unable to find a driver for the dome controller (a Vellman board) and there are still teething problems with the mount (a FS2 controller). All the SX kit works perfectly; not yet tried the focuser. It will be months before I can return to La Palma and try to resolve these issues. 8-(
A Celestron NEXIMAGE 5 purchased via the BAA forum also fails to work under the local Ubuntu installation but I have found a package which claims to contain a driver for the camera.
Other people with more main-stream equipment have no significant problems with Linux-based controllers.