I also can confirm the bug to be present in update-manager 1:0.126.9 of karmic. Neither the proxy setting in synaptic nor the environment variable http_proxy are consulted when trying to the update.
The patch in use-urllib2-in-url_downloadable-3.diff fixed the problem for me.
Quite a long-standing bug, I had to apply the same patch when updating from jaunty to karmic :-(
I also can confirm the bug to be present in update-manager 1:0.126.9 of karmic. Neither the proxy setting in synaptic nor the environment variable http_proxy are consulted when trying to the update.
The patch in use-urllib2- in-url_ downloadable- 3.diff fixed the problem for me.
Quite a long-standing bug, I had to apply the same patch when updating from jaunty to karmic :-(