I had some trouble when I changed the opensource driver nouveau to the proprietary nvidia-390.

The package is broken and when I try to repair It, I can't.

I've also tried to make the change back to the opensource driver anyway, but It became impossible!!

There is a curious observation to make: If I boot with the HDMI cable into the 750 Ti, there will be no video out. I have to boot ubuntu with the APU and then change to the graphics card.

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