[ubuntu] Remastered / unattended Ubuntu 12.04-alternate iso.

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http://ubuntuforums.org – Hi all, I'm in the process of building an unattended installation of Ubuntu 12.04 using this thread: http://askubuntu.com/questions/12250...all-for-ubuntu Unfortunately I can't install packages because my corporate firewall blocks connections to the internet, and only allows it through an authenticated proxy. Luckily, we have a mirror of the 12.04 packages hosted inside our network, the only thing I can't seem to get going, is modifying the installation sources.list to point to the internal mirror. Has anyone had any success with this? Can someone point me in the right direction? (Hardware)