Remote Desktop - RDP blank screen and aborts after disconnect

I found the solution, after putting this line into the terminal, it worked:

echo mate-session> ~/.xsession

If this doesn't help you, try the following command before:

sudo apt-get install mate-core

(I'm not sure but I used a pre-compiled modified ubuntu by hardkernel. Mate was the desktop envoirement, but I was able to "newly" install the mate-core, not just update the existing. Maybe this was problem.)