2 issues fou4s -i -f vnc.rpm did not work for me i tried glibc-2.2.2-64.i386.rpm and i got this at the end MD5 sum OK: ae04855b1588512ba0e7aecdf96a161e gpg: Signature made Mon Aug 12 10:48:46 2002 EDT using DSA key ID 9C800ACA gpg: Can't check signature: public key not found If you only got 'MD5 sum OK: ...' as result, then the package is not signed!