thanks for all who replied for my mail regarding installation error....
today only I found that some problem in connecting internet via terminal,
eventhough proxy address and port no. is correct..
the error I got was
dinesh at dinesh-Infotech:~$ export http_proxy=172.16.32.200:3128
dinesh at dinesh-Infotech:~$ ping www.google.com
PING www.l.google.com (74.125.236.81) 56(84) bytes of data.
From 172.16.100.1 icmp_seq=88 Destination Host Unreachable
From 172.16.100.1 icmp_seq=114 Destination Host Unreachable
From 172.16.100.1 icmp_seq=134 Destination Host Unreachable
From 172.16.100.1 icmp_seq=141 Destination Host Unreachable
From 172.16.100.1 icmp_seq=227 Destination Host Unreachable
From 172.16.100.1 icmp_seq=228 Destination Host Unreachable
From 172.16.100.1 icmp_seq=240 Destination Host Unreachable