Pull from Docker Index and run the image

CID=$(docker run -p 2222:22 -t -d leonpegg/ubuntu-x2go-mate)
docker logs $CID

note down the root/dockerx passwords.

OR

build it yourself.

git clone https://github.com/leonpegg/ubuntu-x2go-mate.git .
docker build -t [yourimagename] .
CID=$(docker run -p 2222:22 -t -d [yourimagename])

docker logs $CID

note the root/dockerx passwords

Download the x2go client for your OS from: http://wiki.x2go.org/doku.php/doc:installation:x2goclient

Create a new session and connect to your seerver Host : (Your Server IP) Port : 2222 Username : root Password : (get it from the Docker logs above)

Select the Session TYPE as : Mate

You can also SSH to the docker container directly with root or dockerx users and their passwords over the port 2222 with linux ssh or windows putty client.

Root will be disabled in newer versions so please avoid using and prefer user dockerx.