F12 update 2010-1070 does not work: untrusted source

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http://forums.fedoraforum.org – Hi, suddenly I have problems with the latest update, FEDORA-2010-1070: - it requires auth because the source is said to be untrusted (?? in an official update??) - but regardless after x-times giving root pw, - no updates get installed! Anybody got a hint?? (HowTos)