I'm getting this error when trying to install FC6 as a guest on RHEL5. I was able to install a RHEL5 guest just fine on the same machine. The only clue I have is that the httpd error_log on the machine serving the disk images gives this error
End of file found: mod_mime_magic: read failed from uncompress of /pathtomount/images/xen/vmlinuz
I'm using the DVD iso image and the sha1sum checked out just fine after downloading.
Have you found a solution? Anyone else?