Purge video driver installation and set to default values

Question

this is the (temporary, though) solution I found

It's not permanent because it's really uncomfortable, but since it was saying me that the nvidia module wasn't loaded, I googled looking for one of those nvidia driver modules that came with ubuntu when I first installed everything. If I'm not mistaken, the drivers that fit my gtx770 are the nvidia 310. So I just purged and reinstalled everything again and then the drivers with sudo apt-get install nvidia-310 and that made it.

This has some big cons, though. I'm unable to start in X and I need to start a X server from tty (that's where I boot, although I told ubuntu not to do that reverting the only change I did). I can't change to nouveau either, and it works somewhat weird.

Next month I'll keep trying, for now I'm good with this.

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I'vee been looking for a solution for a bunch of hours and this is what I've tried so far after installing the latest nvidia driver (which boots me to a black screen with an underscore). This is my second attempt at doing so and this time I've wronged it even more.

This is what I've done so far:

• Downloaded the driver from the official nvidia page. 340.65, for a GTX 770.
• Changed the system to boot into a tty terminal (in the grub conf file changed the value from 'quiet splash' to 'text').
• Went into a tty terminal, stopped x session and opened the installer .run file.
• It gives me a warning saying the script failed, like the first time I tried, and after also googling this time about it, decided to go with it anyway.
• After rebooting, if I $sudo service light dm start it turns into a black screen with an underscore, giving me the error "job start failed" in the terminal I launched it.

• Then, this:

  sudo apt-get remove --purge nvidia-settings
  sudo apt-get remove --purge nvidia-*
  sudo apt-get remove --purge xserver-xorg-video-nouveau xserver-xorg-video-intel
  sudo apt-get install nvidia-common
  sudo apt-get install nvidia-settings
  sudo apt-get install xserver-xorg-video-nouveau xserver-xorg-video-intel
  sudo apt-get install --reinstall libgl1-mesa-glx libgl-mesa-dri x-server-xorg-core
  sudo dpkg-reconfigure xserver-xorg
  sudo apt-get update
  

After the apt-get update it gives me an error in the following repositories:

Failed to fetch http://ppa.launchpad.net/xorg-edgers/nouveau/ubuntu/dists/trusty/main/binary-amd64/Packages 404 Not Found

Failed to fetch http://ppa.launchpad.net/xorg-edgers/nouveau/ubuntu/dists/trusty/main/binary-i386/Packages 404 Not Found

(I have an AMD CPU)

I've tried removing the xorg-edgers repository: sudo ppa-purge xorg-edgers/ppa (also tried it without the "/ppa" as it said when reinstalling the reposityory) but when it's updating packages lists after removing then, it gives me the exact same error back.

I found another command to run a x session, sudo startx. After running it, I get a black screeen. Going back to the terminal where I launched it lets me read the error modprobe: FATAL: Module nvidia not found. written twice at the end of the screen.

Right now I don't really care anymore about the 340.65 NVidia driver (he). I'm fine with going back to nouveau, but I just can't. I guess I need to fix that repository issue first, but I'm clueless about how to follow with this. I could reinstall the OS but that'd be a huge pain in the ass for me, right now. I'm preparing finals and I have loads of programming libraries installed, so I guess they'll all be gone after that. And, anyway, reinstalling the OS is not something desirable when I somewhat know what's wrong.