defaults delete com.apple.systempreferences AttentionPrefBundleIDs
Where I'm fast with upgrading most software I tend to wait out with major OSX upgrades till the kinks get ironed out. So today I set my machine to upgrade itself (took a few hours likely) and after logging on preference panel had a little nag icon. Apple apparently wants me to sign into their 'iCloud' offering. As I only use my laptop for writing code and making music (and an occasional youtube bing) I don't see the added value. I'm glad I took this long to upgrade because now there's all kinds of answers to fix it:
-
A few minutes of duckduckgo-ing learns that apparently the only way via the GUI is to log in to iCloud to disable it (WTFBBQ?).
-
The other advice is to paste the incantation on top of this gist into the terminal; on macrumors and on Apple's own 'Apple community'
That incantation indeed makes the red nagging icon go away, but keeps the advertisement for iCloud in my preference panel.
If I'd want advertisements in my OS I would have chosen MS Windows :-/