x-www-browser is an alternative, managed by the alternatives system. Alternatives are known to suck (they are system-wide preferences, and *not* user preferences). If update-manager really is using x-www-browser, then it needs fixing to not use that.
In any case, this doesn't have anything to do with gnome-control-center
x-www-browser is an alternative, managed by the alternatives system. Alternatives are known to suck (they are system-wide preferences, and *not* user preferences). If update-manager really is using x-www-browser, then it needs fixing to not use that.
In any case, this doesn't have anything to do with gnome-control- center