You have been subscribed to a public bug by Marc Deslauriers (mdeslaur):

Binary package hint: gnome-control-center

Ubuntu version: 
Ubuntu 10.04.1 LTS  and  
Ubuntu maverick (development branch)

Package version:
Lucid: 1:2.30.1-0ubuntu1
Maverick: 1:2.31.91-0ubuntu1

How to replicate:
Go to System -> Preferences -> Network Proxy (or gnome-network-properties)
Manual, Use same for all protocols, proxy.sun.ac.za port 3128
Ignored hosts: *.sun.ac.za and 146.232.0.0/16
Apply Sytem-wide
Restart computer

Part 1:
run: sudo aptitude update
w/h: apt tries to use the proxy to connect to the ubuntu repository at 
ftp://ftp.sun.ac.za/
w/s/h: apt should obey the ignored hosts and connect directly to this server
workaround: comment out "Acquire::ftp::proxy "ftp://proxy.sun.ac.za:3128";"; in 
/etc/apt/apt.conf. Then apt connects directly to ALL ftp servers.

Part 2:
sudo aptitude install flashplugin-installer
w/h: apt calls wget, which on its turn tries to download the flashplugin from 
http://archive.canonical.com directly, without using the proxy server.
w/s/h: wget, which is called by apt, should obey the proxy rules set 
"system-wide" in gnome-network-properties.
workaround: running a transparent proxy on another computer through which the 
traffic is routed. Or "sudo killall wget" a lot of times and let the install 
fail. 
The same happens when installing ttf-mscorefonts-installer, which is also 
called by wine and ubuntu-restricted-extras.

This bug is present since 10.04 and affects all users on networks behind
proxy servers. This includes university networks.

Bug also affects:
aptitude
apt-get
software-center
wget

This bug can be classified as a security vulnerability as access to
update-repositories might be blocked (part 1).

** Affects: gnome-control-center (Ubuntu)
     Importance: Undecided
         Status: New

-- 
gnome-network-properties does not set apt proxy correctly
https://bugs.edge.launchpad.net/bugs/631185
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