I have http_proxy environment variable and I have proxy configured in
/etc/apt/apt.conf.d. This is what I believe to be the correct setup - no
MITM via sudo, and update-manager, apt, aptitude, jockey just work.

Where does the dialog originate from? update-notifier? But is it also
the source of the text? I'd have guessed it's flashplugin-installer-
related script trying to download something, and not using apt's proxy,
and not seeing http_proxy.

Could you not just make the flashplugin-installer script (or whatever is
it that is trying to do the download) pull in /etc/profile? That sounds
sane to me, I don't see it being a hole for the http_proxy hijack as
sudo would be. Sounds safer to me than just passing http_proxy through
sudo. Also note that sudo -i does pull /etc/profile in.

But I don't know what do the GUI tools provided in Ubuntu to set http
proxy do. Whatever the solution, it should work for a user who just sets
http_proxy by GUI. (And this I assume does not set apt proxy, or does
it? Oh...)

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https://bugs.launchpad.net/bugs/977178

Title:
  After upgrading to 12.04, flash doesn't seem to be installed to
  Firefox even though the package is.

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