Please be aware that a fully functional solution should also integrate with 
ntlmaps or cntlm settings, and Proxy Auto Configuration (PAC) settings in that:
- proxy setting is a problem for those frequently switching location
- in the great majority of these cases one of the two environment (work) is 
dominated by MS stuff, and especially proxy ISA server; in these cases a 
dedicated, intermediate proxy is needed, usually on localhost itself
- the most flexible tool currently is the PAC file (javascript) mechanism, but 
it does not intercept "wget" calls from synaptic or apt, I believe

A 360° solution should include, in my opinion, if possible
1) proxy setup for www-like callers (browsers, ftp, ...) which go to the proxy 
directly
2) separate proxy setup for ISA-proxy unable applications 
(apt/dpkg/synaptic/update-manager...) through cntlm or ntlmaps
3) secure authentication for both (don't store passwords, but rather hashes 
(cntlm has it); or even, ask password to the user at the beginning of the 
session, or at first usage)
4) (optional) disable cntlm after having done with synaptic or update-manager 
job
5) all the above based on named "location" management, triggered by IP 
detection or other PAC mechanisms (think of IsResolvable())

Hope it is useful
Thank you very much

-- 
system-wide proxy does not apply to synaptic
https://bugs.launchpad.net/bugs/290313
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