How to fix the screen resolution in linux (lubuntu; to 1920x1080; currently stuck at 1280x1024?

I have installed the lubuntu version [18.04.4 Bionic Beaver LTS (LXDE)] and the screen resolution is for some reason fixed at 1280x1024.

I tried doing the xrandr --newmode by getting the desired screen resolution information using (cvt 1920 1080 60)

but it doesn't fix it in any way.

I get an error; xrandr: failed to get size of gamma for outout default

2 Sorted by: Reset to default

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