Thats kinda to be expected since the gnome-settings package contains all the extensions. The real issue here is the invalid signature 
Anyway its fixed now and you should be able to install both gnome & common settings again 
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Thats kinda to be expected since the gnome-settings package contains all the extensions. The real issue here is the invalid signature
Anyway its fixed now and you should be able to install both gnome & common settings again