It took me a while and some hacking until I figured out how to enable 1366x768 screen resolution in ubuntu 16-04 for my secondary display, a Fujitsu-Siemens TV from pre-HD era, means: HD ready but not providing the full resolution, just 1366x768.
Anyway, here is the magic:
|cvt 1366 768 60
xrandr --newmode 1368x768_60.00 85.25 1368 1440 1576 1784 768 771 781 798 -hsync +vsync
xrandr --addmode VGA-0 1368x768_60.00
xrandr --output VGA-0 --mode 1368x768_60.00
This is sort of what distinguishes a linux system from a Windows system. Often you have to do a lot of weird hacking to achieve certain things.
Nevertheless, I must say, when I had Fedora 25 installed on my computer beforehand it offered 1368x768 screen resolution out of the box, ubuntu didn't. Well, that's what makes linux so exciting for many: the need to tinker and learn interesting technical, sometimes magical secrets.
Thanks to this internet articles I finally solved my problem:
"Resolution" in wiki.ubuntu.com
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