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The exact errors, for optirun glxspheres64:

[ 294.432628] [ERROR]Cannot access secondary GPU - error: Could not load GPU driver

[ 294.432651] [ERROR]Aborting because fallback start is...

I followed your steps Davide3i but when I run "optirun glxspheres64" I get an error that the GPU cannot be accessed and that I don't have the right driver. Am I missing something?

I tried the steps and it didn't work, all I got was a black screen with a flashing cursor in the top left.