Again I tried to make something hard out of something easy. I thought you had to actually build Misssion Planner on Linux to use it. Not so. Actually pretty easy to run MP on linux. I have it running on a TX1 now. Couple of steps.
you need to install Mono from the instructions on this page. This will install the latest version older versions or the one that installs with apt will not work properly. http://www.mono-project.com/download/#download-lin I installed mono-complete. Tried a couple of the other recommendations but they were already installed with complete.
Get the latest beta version of MP and unzip it into a directory. MissionPlannerBeta.zip from here http://firmware.us.ardupilot.org/Tools/MissionPlanner/beta/
command to start up is sudo mono MissionPlanner.exe. Takes some extra time first time through. Probably building p-code for the emulator. Once you run it once it comes up like you are used to seeing.
Now there are some dependencies that might need to be installed. On my system there weren't any. However if it complains or better yet before you install Mono go to the ArduPilot github page and click on MissionPlanner. At the bottom of the page there is a list of the dependencies. So you can check to see if they are installed before you do the mono install.
I just did this today I was able to connect and another guy that followed the instructions was able to download firmware to the fc with it. No reason it won't work just fine. Its alway been able to run under mono. It runs under mono on a windows machine.
So have fun with it if you have issues post up and I'll try and help.