I just removed the oibaf packages with

sudo add-apt-repository ppa:oibaf/graphics-drivers -r

I also tried

sudo ppa-purge ppa:oibaf/graphics-drivers

but it said no such drivers existed

I rebooted but I'm getting the same flickering problem

My only option now is to reinstall the OS?

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https://bugs.launchpad.net/bugs/2062504

Title:
  Flickering problems on external monitor with HDMI after installing
  Ubuntu 23.10

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