Hi all, After I updgrade from F17 to F18 with:
su -c 'yum update yum' su -c 'yum clean all' su -c 'yum --releasever=18 --disableplugin=presto distro-sync'
and after I rebooted the system I had and error "failed to authorization manager" and the boot stopped with keyboard disabled. After I entered in text mode for changing the grub configuration at bootable time for updating polkit service, becouse did not work, I finded that the net is disabled and after many hours of work I am blocked. Any suggestions would be appreciate.