I installed the Linux version of Steam on Ubuntu. When
TF2 finally downloaded, it was very slow.
So I guessed it was because I needed drivers for my graphics card.
So I downloaded the closed source unified Nvidia driver.
I got a error saying that I need to stop the X server, so I typed "sudo stop lightdm", then I got a message saying that on some Linux distros, the installer can automaticaly modify a file to disable the Nouveau graphics driver. So I did that, then it said that I need to restart my computer.
After restarting my computer, when ever I press Ctrl + Alt + F1 - F6, I get a blank screen and when I type "sudo stop lightdm" into the terminal, Ubuntu crashes after I enter my password.
I heard that the blank screen problem when pressing Ctrl + Alt + F1 - F6 can be solved by opening the terminal and typing "sudo sed -i -e 's/#GRUB_TERMINAL/GRUB_TERMINAL/g' /etc/default/grub" then typing "sudo update-grub".
When I restart my computer, I only get a black and white boot screen and I only get a flashing underscore when I press Ctrl + Alt + F1 - F6.