HT – http://martin.leyrer.priv.at/y2013/m03/Connecting_to_a_Raspberry_Pi_via_USB_TTL-Serial_with_Ubuntu_Linux.html
ls -l /dev/ttyUSB0 #verify device is attached sudo adduser [the user you want to add] dialout
REBOOT
sudo reboot now
CONNECT VIA TTL SESSION
screen /dev/ttyUSB0 115200
From Linux (Ubuntu) you can remote forward the x-windows GUI apps
ssh -YC user@ip
then run a gui app, ie: lxpanel, lxsession, wpa_gui