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?

  • is their any free proxy details available so that i can connect and download some packages @ my office. Commented Oct 16, 2012 at 4:50

3 Answers 3


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.

  • 1
    <br> What if in the username there is a "@" char. <br> For example if the username is a complete email address?
    – user247735
    Commented Feb 13, 2014 at 8:08
  • 1
    @Hunger, refer this cyberciti.biz/faq/…. Commented Feb 14, 2014 at 10:57
  • 2
    if you doing this in the morning, don't forget to delete the chevrons
    – llama
    Commented Mar 5, 2014 at 10:49
  • Acquire::socks::proxy "socks5://server:port"; Commented Dec 29, 2016 at 1:56

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:[email protected]: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:[email protected]:8080/";

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

  • 2
    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
    – 719016
    Commented Dec 21, 2011 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
    Commented Dec 21, 2011 at 17:34
  • +1 temporary workaround was a more suitable answer for me!
    – wim
    Commented Nov 21, 2012 at 4:56
  • 1
    @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
    Commented Feb 13, 2014 at 18:35
  • 1
    @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
    Commented Feb 13, 2014 at 23:36

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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