Re: LightDM will not let me log in.
To get to aTTY console or text terminal, press: 'Ctrl+Alt+F1', or from the grub menu edit the Linux /boot line - highlight & press 'e' - adding 'single' [ no quotes] where it says: " ro quiet splash ", and press 'Ctrl+x' to boot.
The first needs you to login with your username and password, the latter takes you directly to a root prompt without needing to log in - so be careful, you will not need 'sudo'.
To stop the X server enter:
If you need more instructions to install the nvidia driver, just ask, or refer to:
sudo service lightdm stop
http://ubuntuforums.org/showthread.php?t=1743535&page=5 Post # 1126
"Better Solutions may bring Worsened Problems": After Lao Tse, b. circa 405BC. a contemporary of Confucius, who died circa 600BC.
They did things differently in those days, apparently!!