Comment 32 for bug 876298

This has nothing to do with the adobe-flash-plugin-tools project. Marking invalid.

The behavior you're seeing is by design. If you want flashplugin-nonfree to use a proxy for downloads, you need to set this via the http_proxy environment variable, and not just using the apt proxy settings. See bug #979477 for the justification for this behavior change.

If you're using the desktop proxy configuration dialog, this will be done automatically for you. Otherwise, you can manually set http_proxy in /etc/environment. Regardless, note that there is a bug in sudo that currently prevents /etc/environment from being applied to sudo sessions: bug #982684.