RPCBIND installation failed ubuntu 10.04

sudo apt-get install rpcbind
Reading package lists... Done
Building dependency tree
Reading state information... Done
Package rpcbind is not available, but is referred to by another package.
This may mean that the package is missing, has been obsoleted, or
is only available from another source
E: Package rpcbind has no installation candidate
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i have downloaded the package rpcbind and tried installation of the same. getting below confilct error
root@cool:/home/sagar/repo# sudo dpkg -i rpcbind_0.2.0-4_i386.deb
Selecting previously deselected package rpcbind.
dpkg: regarding rpcbind_0.2.0-4_i386.deb containing rpcbind:
 rpcbind conflicts with portmap
  portmap (version 6.0.0-1ubuntu2.2) is present and installed.
dpkg: error processing rpcbind_0.2.0-4_i386.deb (--install):
 conflicting packages - not installing rpcbind
Errors were encountered while processing:
 rpcbind_0.2.0-4_i386.deb
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please guide me for the installation of the same.