What’s the best way to record gameplay on Linux/Ubuntu?

You could also try the built-in recording feature from Steam if you have it installed. It's pretty straightforward and works fine for many users.

OBS Studio is a solid choice! It's just as effective on Linux as it is on Windows. You can usually find it in your distro's app store, and it's not limited to just streaming; it also does a great job at recording. Plus, it comes with a replay buffer feature, so you can save those epic moments on the fly!

Definitely give OBS a go. It's very popular for a reason and works really well for recording games. A lot of people swear by it.