Starting unfs3: Cannot register service: RPC: Unable to receive; errno = Connection refused

# apt-get install unfs3
Reading package lists... Done
Building dependency tree       
Reading state information... Done
The following NEW packages will be installed:
  unfs3
0 upgraded, 1 newly installed, 0 to remove and 0 not upgraded.
Need to get 0B/64.1kB of archives.
After this operation, 225kB of additional disk space will be used.
Selecting previously deselected package unfs3.
(Reading database ... 34099 files and directories currently installed.)
Unpacking unfs3 (from .../unfs3_0.9.22+dfsg-2_amd64.deb) ...
Setting up unfs3 (0.9.22+dfsg-2) ...
Starting unfs3: Cannot register service: RPC: Unable to receive; errno = Connection refused
unable to register (NFS3_PROGRAM, NFS_V3, udp).
invoke-rc.d: initscript unfs3, action "start" failed.
dpkg: error processing unfs3 (--configure):
 subprocess installed post-installation script returned error exit status 1
Errors were encountered while processing:
 unfs3
E: Sub-process /usr/bin/dpkg returned an error code (1)
# apt-get install portmap
Reading package lists... Done
Building dependency tree       
Reading state information... Done
portmap is already the newest version.
0 upgraded, 0 newly installed, 0 to remove and 0 not upgraded.
1 not fully installed or removed.
After this operation, 0B of additional disk space will be used.
Do you want to continue [Y/n]? 
Setting up unfs3 (0.9.22+dfsg-2) ...
Starting unfs3: unfs3.

#ubuntu