====== Debian - Backports - Example use of Backport ======

Using backports is simple.

----

===== Configure Backport =====

Add this line to the /etc/apt/sources.list.

<file bash /etc/apt/sources.list>
deb http://www.backports.org/debian etch-backports main contrib non-free
</file>

----

===== Update =====

<code bash>
apt-get update
</code>

<WRAP info>
**NOTE:**  An error message might be seen:

<code>
Reading package lists... Done
W: GPG error: http://www.backports.org etch-backports Release: The following signatures couldn't be verified because the public key is not available: NO_PUBKEY EA8E8B2116BA136C
W: You may want to run apt-get update to correct these problems
</code>

  * This message comes on Debian Etch because you have not imported the backports keyring.

</WRAP>

----

===== Import the backports keyring =====

<code bash>
sudo apt-get install debian-backports-keyring
</code>

----

===== Example install of a backport package =====

To install a newer version of nmap:

<code bash>
sudo apt-get -t etch-backports install nmap
</code>

<WRAP info>
**NOTE:**  

  * **-t etch-backports**:  Since all backports are deactivated by default, the package manager needs to be told to use the backports repository.

</WRAP>


<WRAP important>
**WARNING:**  It you forget to tell apt-get that nmap is installed from backports, and run another apt-get install nmap, it will remove the backports package and install the standard one.

  * A simple solution to this is to use [[Debian:Backports:Pinning Backports|Pinning Backports]].

</WRAP>