dpkg: error processing postgresql (--configure):

root@kiran-desktop:~# apt-get install postgresql
Reading package lists... Done
Building dependency tree
Reading state information... Done
postgresql is already the newest version.
The following packages were automatically installed and are no longer required:
  hplip-firmware libboost-date-time1.34.0 libboost-thread1.34.0 libdb4.6
Use 'apt-get autoremove' to remove them.
0 upgraded, 0 newly installed, 0 to remove and 0 not upgraded.
2 not fully installed or removed.
Need to get 0B of archives.
After unpacking 0B of additional disk space will be used.
Setting up postgresql-8.2 (8.2.5-1) ...
 * Starting PostgreSQL 8.2 database server * The PostgreSQL server failed to start. Please check the log output:
2007-09-23 16:19:46 IST LOG: could not load root certificate file "root.crt": no SSL error reported
2007-09-23 16:19:46 IST DETAIL: Will not verify client certificates.
2007-09-23 16:19:46 IST LOG: could not bind IPv4 socket: Cannot assign requested address
2007-09-23 16:19:46 IST HINT: Is another postmaster already running on port 5432? If not, wait a few seconds and retry.
2007-09-23 16:19:46 IST WARNING: could not create listen socket for "localhost"
2007-09-23 16:19:46 IST FATAL: could not create any TCP/IP sockets
                                                                         [fail]
invoke-rc.d: initscript postgresql-8.2, action "start" failed.
dpkg: error processing postgresql-8.2 (--configure):
 subprocess post-installation script returned error exit status 1
dpkg: dependency problems prevent configuration of postgresql:
 postgresql depends on postgresql-8.2; however:
  Package postgresql-8.2 is not configured yet.
dpkg: error processing postgresql (--configure):
 dependency problems - leaving unconfigured
Errors were encountered while processing:
 postgresql-8.2
 postgresql
E: Sub-process /usr/bin/dpkg returned an error code (1)
root@kiran-desktop:~#