Ubuntu Desktop Guide > Tips & tricks says that we can start and stop a screencast by pressing Ctrl+Alt+Shift+R. It works. But it automatically stops at 30s.

Is there a default settings somewhere for that? Or is it a bug?

Before on Ubuntu 17.04 I used gtk-recordmydesktop but now it won't launch. I tried simplescreenrecorder and vokoscreen but for some reason the screen goes black in the result file. The cursor is visible though.