You can try importing all of the keys or disable gpg key check just for the
rawhide installation.
Imported all the RPM-GPG keys files, but nothing changes. Also, the command "yum localinstall xscreensaver-extra" gives the same error about xscreensaver-extra not being signed.... How to disable gpg check? Is it safe?
yum install xscreensaver-extras works fine here.
It works also for me, but I would like not to download packages two times, one for syncronizing and one for updating... Gianluca