On Fedora 9 with packagekit 0.2.5 : running /etc/cron.daily/packagekit-background.cron from the package PackageKit-cron give this error : Option 'update-system' not supported Command failed but running /usr/share/PackageKit/helpers/yum/update-system.py directly works.
Fixed in 134ea622cbeba4ba3de9761a99db9dec07282018, many thanks.
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