Hi @pavlos_kairis, OH YES! When installing on a VM I've gotten in the habit of "Trying" just so I can change resolution - a good workaround.
I did just verify 17.10 nightly on my native hardware has no issue. It's nVidia so nouveau gets loaded and ends up full res on this 1920x1200.
If you get stuck installing at 800x600 it can be a show-stopper as I recall. If it can end up at 800x600 it will on some systems so the screens better work there, period.
My point is, if it is presented as a problem in a VM it'll get lowered to the basement of priority. So who sees this on native hardware? Anyone?
Also, I didn't search but I'd bet there may already be a bug report.