Debian/Ubuntu’s apt behind a proxy

To allow the Advanced Packaging Tool, or just APT for friends to do its job when the box is behind a proxy, we can use one of the following options.

From the command line (this will only work for the session we are working on):

export http_proxy=http://username:password@server:port

Or if the proxy does not require a username:

export http_proxy=http://server:port

Another option is to add the following line into the file /etc/apt/apt.conf (note the semicolon at the end):

Acquire::http::Proxy "http://username:password@server:port";

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