Tinkerboard (old one, not S) to be used as x2go thin client. Installed latest image (5.70_Tinkerboard_Ubuntu_bionic_next_4.19.14_desktop), applied all updates. Working fine (thanks to everybody who contributed). Issue remaining: My Tinkerboard refuses to use the monitor's native display size of 1920x1200, tried several monitors and cables (HDMI to DVI adapter cables, in case this is relevant). Without any modifications, Armbian desktop comes up with 1280x960. I used xrandr to set 1920x1080 (works), but 1920x1200 leads to "xrandr: Configure crtc 0 failed". Any chance to resolve this?