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nfs-kernel-server is already the newest version.
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Setting up nfs-kernel-server (1.0.6-3.1) ...
Stopping NFS kernel daemon: mountd nfsd.
Unexporting directories for NFS kernel daemon...done.
Exporting directories for NFS kernel daemon...done.
Starting NFS kernel daemon: nfsdinvoke-rc.d: initscript nfs-kernel-server, action "restart" failed.
dpkg: error processing nfs-kernel-server (--configure):
 subprocess post-installation script returned error exit status 1
Errors were encountered while processing:
 nfs-kernel-server
E: Sub-process /usr/bin/dpkg returned an error code (1)