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We have proxy-server and I run Linux Mint 15 Mate. I've set up network connection and Firefox prompts for login/pass and then connects to Internet. When trying to look for updates/new software, system does not prompt for login/pass and cannot connect to Internet. What should be done to have system accessing Internet and getting updates/installing new software?

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# man apt.conf
       http::Proxy sets the default proxy to use for HTTP URIs

You need to edit config file: /etc/apt/apt.conf to configure APT package handling utility.

Additionally read about ProxyChains - redirect connections through proxy servers.

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ProxyChains is not exactly what I need. As for editing apt.conf, it did not help. Still cannot connect to repositories to update system or anything like this. It is interesting that Firefox has access through login/pass prompt, whereas Chromium doesn't. I tried to set up it using command chromium-browser --proxy-server=server:port, but it still does not connect. – javlon Aug 14 '13 at 11:10

Go to:
Package Manager -> Settings -> Network
Re-Enter your Proxy IP/Port and klick on Authentication to set login/pass

How to find Package Manager this could help: Mint: How to Open the Package Manager

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Clicking on Authentication opens menu login/pass, but these windows remain inactive and I cannot fill them out. What's wrong? – javlon Aug 14 '13 at 11:13

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