You can use Ctrl+L keyboard shortcut in Linux to clear the screen. It works in most terminal emulators. If you use Ctrl+L and clear command in GNOME terminal (default in Ubuntu), you’ll notice the difference between their impact.

How do I completely clear terminal?

Use ctrl + k to clear it. All other methods would just shift the terminal screen and you can see previous outputs by scrolling.

What is the use of clear command?

Use the clear command to empty the screen of messages and keyboard input. The system clears the screen and displays the prompt.