OS: Ubuntu 18.04
I used to always use the shortcut Ctrl+Alt+F1 to log out of my main user, which will show the GUI listing all users you can login to. However, one day I pressed those keys and suddenly a black screen similar to teletype appeared.
The keyboard shortcuts must have reset to default somehow. Even though I don't remember setting Ctrl+Alt+F1 as a special shortcut to log out, which would replace Ctrl+Alt+Del, I imagine the only possible explanation is that I did set that keyboard shortcut to log out, and that it is not the default keyboard shortcut.
I read these two posts:
Reverting from Ctrl - Alt - F1
What is a tty, and how do I access a tty?
So, I now understand that, in 18.04, the following shortcuts are available:
Ctrl+Alt+F2 exits teletype.
Ctrl+Alt+F3-6 takes you to tty3-tty6.
Most AskUbuntu posts I found explain these shortcuts for versions of Ubuntu older than 17.10, so they are not that useful in this case.
My question is, what does Ctrl+Alt+F1 do on Ubuntu 18.04 ? (What is that black screen with 15-20 lines of white text that do not let you type in any input? )
And, what does Ctrl+Alt+F7 do on Ubuntu 18.04?