NFS is not installed by default on Ubuntu, so you need to install the
nfs-kernel-server package. NFS itself consists of several programs that work together. One is
portmap, which maps NFS requests to the correct daemon. Two others are
nfsd, which is the NFS daemon, and
mountd, which controls the mounting and unmounting of file systems.
Ubuntu automatically adds NFS to the system startup scripts, so it will always be available after you have configured it. To check this, use the command
sudo /etc/init.d/nfs-kernel-server status and you see that the service is running. If you need to manually start the NFS server, use the following command:
matthew@seymour:~$ sudo /etc/init.d/nfs-kernel-server ...