nfs-kernel-server fails to start

$ sudo /etc/init.d/nfs-kernel-server start
 * Exporting directories for NFS kernel daemon... [ OK ]
 * Starting NFS kernel daemon rpc.nfsd: Setting version failed: errno 16 (Device or resource busy)
rpc.nfsd: writing fd to kernel failed: errno 110 (Connection timed out)
rpc.nfsd: unable to set any sockets for nfsd

ProblemType: Bug
DistroRelease: Ubuntu 10.10
Package: nfs-kernel-server 1:1.2.2-1ubuntu1.1
ProcVersionSignature: Ubuntu 2.6.35-30.56-generic-pae 2.6.35.13
Uname: Linux 2.6.35-30-generic-pae i686
NonfreeKernelModules: nvidia
Architecture: i386
Date: Fri Aug 5 13:46:23 2011
InstallationMedia: Ubuntu 10.10 "Maverick Meerkat" - Release i386 (20101007)
ProcEnviron:
 SHELL=/bin/bash
 PATH=(custom, user)
 LANG=en_US.utf8
SourcePackage: nfs-utils