Before I begin I know what I have just done is massively stupid, my defense is not great, I had a few drinks and it seemed like a good idea.

So I upgraded from Ubuntu 14.10 to 15.04, all good no problem. I
should have left it there and been satisfied, unfortunately the white rum demon said "why don't you see what you can do to spruce up you're graphics drivers?" This is the part where it all went wrong. I foolishly opened up 'additional drivers' and changed my nvidia driver from 340 to 349 (no real issue there) but also saw the Intel driver sat below in a separate section labeled 'unused' and thought I ought to enable that too. To compound this error I then rebooted. Now funny enough X throws a hissy and all I see on boot is a black screen with a mouse pointer. I can ctrl-alt-f1/2/3 etc into a TTY but have no idea how to disable the Intel driver to allow me to get back into my graphical desktop. Please forgive my stupidity and help!!!

Hi...

Do any of the commands here help, particularly the part about using the CLI to set the default cards?

BTW, your signature is hilarious!

Regards...

Thanks for the reply ardvark71, unfotunately it came a bit late for me, I took the plunge and did a clean re-install as I needed things up and running. I suspect the link you posted would have been just what I needed though.

The signature pretty much sums me up I'm affraid, at times I get into tinkering and suddenly get the 'kid in a sweet shop' mentality and stuff falls over spectacularly!!

You're welcome, glad to help

If the fresh reinstall fixed the issues, if you would, please mark this thread as "SOLVED."

Thanks!