Was JACK running when you tried to launch it? Try running it from a terminal again and post the full output here, it might point to some answers.
Well I have to say I installed it just to see what your problem might be 
but I have known about it since it was first announced although never really got around to using it. I think I was just starting to get in to vcv when it was released and since that point I’ve had less and less desire to do anything outside of Rack. I certainly think it looks fantastic though and very much appreciate it being available on linux.