No profiles are available Error

So, I have a problem. When I try to download a JAR file in the profiles tab, there’s just nothing, and I get an error that says: “No profiles available; check internet connectivity and refresh the profile list.” I’ve checked if I have an internet connection, and I do.

One more thing: I can’t change the localization in the localizations menu. (By the way, I’m new to everything related to MineOS and Linux.) I am using Ubuntu 20 LTS.