Nur als Ergänzung: mit diesem Tool kann man zB seine gespeicherten Reddit Posts als Lesezeichen exportieren

It seems like Lemmy does not have this functionality yet https://feddit.de/post/753220

I hate linking you to reddit but this post came to mind Choosing an instance; and my issues with lemmygrad

You probably mean Gnome 3. Ubuntu then developed and used its own DE Unity for a while. They have since changed back to Gnome though. And Gnome has changed again with Gnome 40 and up.