Fully patched ubuntu server 14.04.2 server.  Using the x2go stable PPA.  When trying to install x2goserver, I get the following:

surfrock66@sr66-blade:~$ sudo apt-get install x2goserver x2goagent nxagent

Reading package lists... Done

Building dependency tree       

Reading state information... Done

Some packages could not be installed. This may mean that you have

requested an impossible situation or if you are using the unstable

distribution that some required packages have not yet been created

or been moved out of Incoming.

The following information may help to resolve the situation:

The following packages have unmet dependencies:

 nxagent : Depends: libxcomp3 (= 2:3.5.0.28-0~481~ubuntu14.04.1) but 2:3.5.0.29-0~591~ubuntu14.04.1 is to be installed

           Depends: libxcompext3 (= 2:3.5.0.28-0~481~ubuntu14.04.1) but it is not going to be installed

           Depends: libxcompshad3 (= 2:3.5.0.28-0~481~ubuntu14.04.1) but it is not going to be installed

E: Unable to correct problems, you have held broken packages.

surfrock66@sr66-blade:~$ sudo dpkg -s libxcomp3 | grep Version; sudo dpkg -s libxcompext3 | grep Version; sudo dpkg -s libxcompshad3 | grep Version

Version: 2:3.5.0.29-0~591~ubuntu14.04.1

Version: 2:3.5.0.29-0~591~ubuntu14.04.1

Version: 2:3.5.0.29-0~591~ubuntu14.04.1

Seems the PPA hosts x2goserver, which depends on x2goagent, which depends on nxagent, which depends on these 3 libraries being downrevv'd.