How do I record my screen in Linux?

Start recording by pressing Ctrl+Alt+Shift+R on keyboard. Stop recording also by pressing Ctrl+Alt+Shift+R. Maximum video length is 30s (change it via following steps). Full-screen recording only.

Does Linux have a built-in screen recorder?

GNOME Shell Screen Recorder

Little known fact: there’s a built-in screen recorder in Ubuntu. It’s included as part of the GNOME Shell desktop and, although it’s well integrated it’s also well hidden: there’s no app launcher for it, no menu entry to it, and no quick button to turn it on or off.