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I've installed Ubuntu 13.04. My problem is that I'm inside the third level Windows Domain Network (stan.domainname.lan) which is using ISA Proxy server.

When I login into Windows, I usually type DOMAINNAME\username (Windows PC is connected to DOMAIN). My problem is in Ubuntu I can use internet only from browser (browser settings: proxy, port:8080). I have the following configuration in /etc/apt/apt.conf:

Acquire::http::proxy "http ://STAN\username:password@proxy:8080/";

In the terminal I'm getting this:

archive.canonical.com/ubuntu/dists/raring/partner/binary-amd64/Packages  407  Proxy Authentication Required ( The ISA Server requires authorization to fulfill the request. Access to the Web Proxy filter is denied.  )
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