Ubuntu suddenly at 1024x768 resolution and 'unknown monitor' after reboot

Did a reboot after changing my computer's hostname, and suddenly only one of my monitors gets an image - and is now stuck at 1024x768 resolution, with display settings saying 'unknown monitor'.

Before reboot I had 4 monitors working with max resolutions and correctly identified, the primary one a widescreen running 3440x1440.

I have no idea what caused this. Before reboot I remember doing 2 things that "changed things":

1. Struggled with trying to install Steam (client refused to start after installing through Ubuntu Software). Ended up doing sudo apt purge steam and sudo apt autoclean && sudo apt autoremove a couple of times.

2. (unrelated to 1) Changed computer hostname (edited /etc/hostname and /etc/hosts)

Anyone have an idea what may have caused this, and how I can fix it?

1 Answer

Got it! All I needed to do was run sudo ubuntu-drivers autoinstall and reboot.

Thanks to Pilot6 over at Ask Ubuntu for the solution.

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