[113802]

That's not a terminal but the boot screen and gives you detail why the GUI isn't loading. You can drop down to TTY to access terminal and fix it.

 

[113802]

My mistake, I thought that command prompts in Linux were command lines.

So to get access to the command line next time I just press the down arrow key?

Ctrl+Alt with function keys F3 to F6 to access TTY. You can have 4 different sessions opened which you can switch between with F3-F6.

Ctrl+Alt with function key F1/F2 will bring you back to the GUI this case boot screen.

 

[113802]

The problem was pressing Ctrl + Alt + F3 to F6 did not allow me to enter any commands.

When you pressed Ctrl + Alt + F3 to F6 did it take you to TTY where it would ask you for your username and password?

 

[113802]

No just a blank screen with a blinking cursor.

Now I understand, the blinking cursor is the "GUI" when you press Ctrl + Alt + F3 to F6 it takes you to the boot screen and shows that your OS can't boot properly.

What was the last thing you did before this occurred?