How to switch to a command-line console [duplicate]

I have just upgraded my system but it boots to Low Graphics mode by default. I have seen questions on how to solve this problem and they all suggest to run a couple of commands from a command-line interface.

But there isn't any command-line console by default in Low Graphics mode and hence, I cannot run those commands. And, the answers I saw to solve the problem doesn't explain this situation either.

How to switch to a command-line console in order to run the commands in Low Graphics mode?

Solution 1:

1. Open a text-only console by using the keyboard shortcut Ctrl+Alt+F3.

2. At the login: prompt type your username and press Enter.

3. At the Password: prompt type your user password and press Enter.

4. Now you are logged in to a text-only virtual console, and you can run terminal commands from the console. To reboot the system from the console run the command: sudo reboot. Press the keyboard shortcut Ctrl+Alt+F7 to exit from the virtual console. In Ubuntu 17.10 and later press the keyboard shortcut Ctrl+Alt+F2 to exit from the virtual console.

5. Sometimes if you just run the command: sudo reboot from the console, your computer will boot to your normal login screen when it reboots. This does not work every time or in all situations, but you may want to try it once anyway. Also this way of getting to your normal login screen is a workaround that does not fix anything, so you will still need to do something to fix your low-graphics mode problem.