Comment 29 for bug 556293

Note that for many releases now the proxy configuration guy (through ubuntu-system-service) is supposed to set the proxy in both the environment and the apt configuration. It will also ask you whether you want to apply a proxy configuration system-wide if you try to change it for your user only. Is that working, or broken?

I reiterate that sudo is the wrong place to fix this. These days software-center, apt-daemon, etc. don't use sudo, so having this hack there wouldn't actually help to make the package installers see the proxy. This really needs to be solved by respecting the proxy settings in /etc/environment.