I'm coming from windows and still new to Ubuntu. Occasionally everything freezes and I lose my taskbar and launcher. What do I do? What's the Ubuntu equivalent of ctrl+alt+del in Windows? I tried alt+f2 to bring up the "special terminal," but what can I do from there? I tried "sudo shutdown now" but that didn't fully shut down the computer and I needed a hard shutdown.
If I do manage to figure out what's wrong and fix it from the alt+f2 terminal, how do I get back to the desktop?