When you are at the office on a Windows network, you often find yourself being unable to connect to sites or remote services. Typically you are operating behind corporate firewalls.
On a Windows Network most applications trying to access a remote host should add NTLM authentication information to a request in order to be able to connect. NTLM is an authentication protocol for Microsoft networks. When not adding this information, a proxy server will disallow access to the remote host.
Fortunately there is a workaround for this annoying problem 
You can download a program called CNTLM. NTLM is a proxy that runs on your local machine and adds NTLM authentication to all outgoing proxy requests. After installing CNTLM you can register it as a Windows service so it runs silently in the background. In applications not being able to connect you specify your local CNTLM proxy as the applications proxy server. No you suddenly are able to connect to services like dropbox, svn, etc.
CNTLM runs on Windows, Linux and Unix. You can find CNTLM here.
When you install CNTLM on Windows, make sure to edit the .ini file that is located in the Program Files\Cntlm folder and not the one from the unzipped install folder!
Please show me how to install this Cntlm in ubuntu. I have downloaded the file but I don’t know how to install manually in ubuntu. Your help will be greatly appreciated.