http://samhassell.com/apt-cant-see-sources-try-changing-the-user-agent/
If you are trying to use apt behind a corporate firewall, try changing the user agent apt is using with wget to load the package lists. By default it uses:
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User-Agent: Debian APT-HTTP/1.3
which isn’t recognised by the filter.
Create and edit /etc/apt/apt.conf
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sudo vi /etc/apt/apt.conf
Paste the following into the file:
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Acquire
{
http::User-Agent "Mozilla/5.0 (Windows NT 5.1; rv:25.0) Gecko/20100101 Firefox/25.0";
};
Update apt
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sudo apt-get update
Tada.
