Because after install Ubuntu10.10, the ntlmaps is occupy more CPU, I have to think about other way to get internet behind proxy.
install cntlm and config /etc/cntlm.conf now.
Username <your username>
Domain iitm.ac.in
#Password password # Use hashes instead (-H)
#Workstation netbios_hostname # Should be auto-guessed
Proxy my_proxy:3128
after run the below command
ntlm -H -M http://my_proxyn:3128
got
Auth NTLMv2
PassNTLMv2 92953DD3F4793300AE493833E9F6EC37
copy past these two lines to cntlm.conf
done. good and fast than ntlmaps.