Display not what I had hoped

I have a pretty ok PC: i3 processor (no graphcs card though) but my monitor can handle 1920 x 1080 yet with zorin I can only get either 1024 x 768 (which is poor) or 800 x 600 (which is hopeless). How can I get 1920 x 1080 as think it should be possible.

Using xrandr --newmode and xrandr --admode, a user should be able to add and then switch to a preferred resolution: