Comment 18 for bug 516032

I'm using Natty..to resolve my proxy problem I had to do the #7 and #13 tricks..
so I did like this..

$sudo visudo
then add the following lines
   Defaults env_keep="http_proxy"
   Defaults env_keep="https_proxy"

then:

  $ sudo bash
  # export https_proxy=http://[username:password@]www.proxy.com:8000/
  # add-apt-repository ppa:<whatever>

p.s. I used the ip of my proxy instead of its dns name..