sudo apt-get install nfs-kernel-server
to install the necessary packages on the server
Create a directory anywhere you want, which will contain the shared filesystem. For example:
sudo mkdir /srv/nfsv4
sudo mkdir /srv/nfsv4/freigabe1
Once done, edit the file /etc/exports like so:
/srv/nfsv4 192.168.2.0/24(rw,sync,root_squash,no_subtree_check,fsid=0)
/srv/nfsv4/freigabe1 192.168.2.0/24(rw,sync,root_squash,no_subtree_check)
Once connecting to the NFS on the client, choose the servers IP address as the server address, and the entire path (e.g. /srv/nfsv4/freigabe1) as the share directory.
Finally, reload the settings:
sudo service nfs-kernel-server reload