@Petrika: lintian errors or warnings won't affect the driver. As for broken packages and black screens, this fix is specific to users who have the xserver-xorg-hwe-18.04 package installed. A black screen can be caused by different things.
I am not sure why you would install the nvidia-340 package using gdebi.
@Petrika: lintian errors or warnings won't affect the driver. As for broken packages and black screens, this fix is specific to users who have the xserver- xorg-hwe- 18.04 package installed. A black screen can be caused by different things.
I am not sure why you would install the nvidia-340 package using gdebi.