Sometimes we may meet the software outdated or dependency problem, so it’s necessary to update some of your stable packages to solve such problems.
The first, you have to add the backport source.list into /etc/apt/source.list, and than update your your package repositories.
$ sudo vim /etc/apt/sources.list
# Add your Debian Lenny Backports repository
deb http://backports.debian.org/debian-backports lenny-backports main contrib non-free
$ sudo apt-get update
$ sudo apt-get -t lenny-backports install debian-backports-keyring
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Install the backports package for your dist:
$ sudo apt-get -t lenny-backports install xxx
Reference:
http://wiki.debian.org/Backports
