The software update preference panel is stuck

I also had this problem on Catalina and the following solved it:

1. I restarted Mac in Safe Mode
2. Preferences > Software Update pane then worked normally
3. Still in Safe Mode, I applied the software updates for Catalina that appeared
4. I restarted Mac normally via menu > Restart...
5. Preferences > Software Update pane worked normally

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If you failed with apple support after 2 weeks. I recommend scheduling a visit to the apple store. I don't have much information to go off of but all i can tell from this is after 2 weeks you have tried everything with no luck.

Minoumax wrote: "...But is not working for me. After restarting in safe mode the panel is the same :-("

Are you sure you were in Safe Mode?... "On either the first or second login window, you should see ”Safe Boot” in the upper-right corner of the window." [Source: Apple]

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Dumb questions first. Did you check if you Mac is compatible? How long has it been stuck? Are you the admin? Have you tried force shutting down and restarting and mostly, did you backup before you started?

Best of luck to you I really don't like to see that happen to anyone

Same here, on Catalina.

Typing "softwareupdate -l" in Terminal leads to a "Finding available software" message but no response.

Thanks very much, Alancito! That works. :-)