So I followed this guide in order to be able to remotely connect to a new VPS (running Ubuntu 18.04 LTS) and have a GUI since I need to perform certain actions that require a visual interface.
Anyway, it worked fine and I can now run a VNC server and connect to it, however the resolution is very low (looks like 1024 x 768), and I cannot work out how to increase it.
There are no physical screens since it is a VPS, which means that xrandr doesn't work, can't even create virtual screens using it because whatever I try I seem to end up at
Can't open display.
Does anyone know how I can increase the resolution (to something like 1920 x 1080)?