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I've got an Ubuntu 11.10 system connected via a proxy to the internet, and I would like to install packages via apt-get. When I try to do that I get this error message:

sudo apt-get install libboost-program-options-dev
Err http://gb.archive.ubuntu.com/ubuntu/ oneiric/main libboost1.46-dev i386 1.46.1-5ubuntu2
407  Proxy Authentication Required

Any ideas?

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is their any free proxy details available so that i can connect and download some packages @ my office. –  Jaison Justus Oct 16 '12 at 4:50
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4 Answers

up vote 23 down vote accepted

This method worked for me.....just have a try...

check the file /etc/apt/apt.conf

The contents were,

Acquire::http::proxy "http://<proxy>:<port>/";
Acquire::ftp::proxy "ftp://<proxy>:<port>/";
Acquire::https::proxy "https://<proxy>:<port>/";

This was the reason why you could reach proxy but couldn't get past it, since there is no username password information. So just put that info into it..

Acquire::http::proxy "http://<username>:<password>@<proxy>:<port>/";
Acquire::ftp::proxy "ftp://<username>:<password>@<proxy>:<port>/";
Acquire::https::proxy "https://<username>:<password>@<proxy>:<port>/";

save the file and you are done...

BROTIP: More better add these lines in another file, /etc/apt/apt.conf.d/80proxy. This will ensure that after a version upgrade changes won't be lost.

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<br> What if in the username there is a "@" char. <br> For example if the username is a complete email address? –  Hunger Feb 13 at 8:08
@Hunger, refer this cyberciti.biz/faq/…. –  Vineet Menon Feb 14 at 10:57
if you doing this in the morning, don't forget to delete the chevrons –  ldgorman Mar 5 at 10:49
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To configure a proxy temporary, set the http_proxy environment variable. If the proxy is proxy.example.com on port 8080 and you need to authenticate with username user and password pass, run:

sudo http_proxy='http://user:pass@proxy.example.com:8080/' apt-get install package-name

To set such a proxy permanently, create /etc/apt/apt.conf.d/30proxy containing:

Acquire::http::Proxy "http://user:pass@proxy.example.com:8080/";

The changes are immediately visible the next time you run apt.

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It's still not working, same error. I should mention I have my proxy set up globally on Applications -> System Tools -> System Settings -> Network Proxy -> Apply system Wide –  213441265152351 Dec 21 '11 at 14:44
The proxy connection works for me (tested with netcat as well as Squid). What proxy server is in use? Some proxies may need other authentication methods. –  Lekensteyn Dec 21 '11 at 17:34
+1 temporary workaround was a more suitable answer for me! –  wim Nov 21 '12 at 4:56
@Lekensteyn : why did you choose the '30' prefix? i now it define the order of parsing, but: is there a convention about 30 for proxy? –  jgomo3 Feb 13 at 18:35
@jgomo3 I probably looked at the other files (or a README in that directory if it exists?) and then picked a value at random. The files are read in alphabetical order. –  Lekensteyn Feb 13 at 23:36
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An alternative is to use Synaptics Package Manager, setting in its Preferences the proxy to which you want to connect. You can find the configuration using this path: Settings -> Preferences -> Network

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Crap!! You don't need all these.
Follow below code.

sudo -s

(provide your password)

# export http_proxy=http://proxy-url:80 
# apt-get install software-name
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