First of all I should say that I have very limited computer knowledge so go easy on me. I have Ubuntu 15.10 installed on my laptop and I was trying to to install the driver for the Nvidia video card but an error kept popping up saying that the x server was on so the installation cannot be completed, so I disabled lightdm and went into the tty terminal and installed the driver (which was a .run file btw) from there, after I was done I started it again but the computer seemed to freeze so I rebooted it now I'm stuck in the login screen and whenever I type my password it just sends me back to the same screen. I tried going back into the tty and typing sudo start lightdm But it said that it failed to connect to socket /com/ubuntu/upstart. Btw sorry I'm using my phone so I can really format stuff properly. Update: typing
lspci -k | grep -EA2 'VGA|3D'
Yields this output
Again I apologize for taking a picture of the screen but I can't really do much from my laptop right now.