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My university set proxy to use Internet for us. I set proxy "172.16.0.6" for using internet in university. Now when in home I run "sudo apt-get update" it generates an error although I set default options of proxies in Internet options.

Err http://pk.archive.ubuntu.com precise Release.gpg Unable to connect to 172.16.0.6:8080: Err http://pk.archive.ubuntu.com precise-updates Release.gpg Unable to connect to 172.16.0.6:8080:

E: Some index files failed to download. They have been ignored, or old ones used instead.

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Welcome to Ask Ubuntu! Well, the error message is really clear: the proxy isn't reachable, so it sounds more of a networking issue. Please include the exact APT configuration lines you've changed. Also the output of nmap -PN8080 172.16.0.6 would be helpful. Provide this information by editing your question. – gertvdijk Feb 2 at 11:58
There was some network problems that I fixed in network settings. Thanks. – muak Feb 12 at 17:19

closed as too localized by fossfreedom♦ Feb 12 at 21:09

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