dpkg/dselect/methods/multicd/desc.multi_nfs

Installation across the network, from an NFS server which is not
currently mounted.

The server should contain the Packages.gz file from each distribution
area being installed (usually main, contrib, non-free, local and
eventually non-US) as well as the corresponding binary/*/*.deb files.

The easiest way for them to get this is to make a (partial) copy of
the distribution site's directory hierarchy, if possible.

The contents of the mounted directory may change.  Thus it's possible
to use this method for installations from a CDROM set.