Thanks. In the meantime :
apt-get install portmap
I could not find a portmap or rpc.portmap binary in /sbin or /usr/sbin. portmap is required for mounting some (all?) NFSv3 filesystems. portmap should be included in future releases.
Thanks. In the meantime :
apt-get install portmap
One more thing: nfs-common is also required for NFSv3 mounts. Just tested it, and NFSv3 filesystems will mount on Backtrack 4 once portmap and nfs-common are installed.