I have tried to ask this question in User mailing list, but couldn't get any help, so I am hoping the developer mailing list can provide a solution.

I have X2Go server installed on my Ubuntu 14.04 computer, and have X2Go client installed on my Windows 7 computer. When I try to use "Connection to local desktop" to remotely connect to Ubuntu, I will get a connection failed error: "No protocol specified xwininfo:error:unable to open display ":0"