Comment 13 for bug 932088

Hi Paul,
  Some more debugging info is in bug 948461, but it looks like, for the moment if you set apt to use 'Acquire::http::Pipeline-Depth=0', then many of your errors may go away.
  Could you please try in your builds to do (prior to even apt-get update):
$ echo "Acquire::http::Pipeline-Depth 0;" | sudo tee /etc/apt/apt.conf.d/99no-pipelining