Comment 2 for bug 443404

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MattPie (piechota) wrote : Re: add-apt-repository insists on downloading GPG key even if keyserver is down. If keyserver is down, add-apt-repository can't proceed.

It looks like add-apt-repository doesn't seem to set the http_proxy variable for GPG, so if you're behind a proxy the keyserver is always 'down'. The process hangs and the only signal it seems to respond to is -9 (C-\).