Currently I am learning how to use Ubuntu, and while I am using Ubuntu 17.10. My HDMI connection to the Acer Monitor works perfectly fine. However, Ubuntu 17.10 has some problems about apt-get updates on my machine.
So I have to switch to Ubuntu 16.04. Unfortunately, in Ubuntu 16.04, it can not recognize my HDMI-connection to the Monitor.
I don't know why. Although, I tried different solutions already, but It did not change much. solution: https://askubuntu.com/questions/966883/vga-not-listed-in-xrandr-output-projector-not-working-intel-kabylake-graphics/968522#968522
And I hate to admit, but I don't want to mess around with xconfig, that gave me a headache with a log-in loop.
If anyone can help - I really appreciate.