General:
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http://packages.debian.org/stable/admin/apt
apt security updates line:
deb http://security.debian.org/ lenny/updates main contrib non-free
http://mirrors.xmission.org/debian/
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What does the stable directory contain?
stable/main/
This directory contains the packages which formally constitute the most
recent release of the Debian GNU/Linux system. These packages all comply
with the Debian Free Software Guidelines, and are all freely usable and
distributable. http://www.debian.org/social_contract#guidelines
stable/non-free/
This directory contains packages distribution of which is restricted in
a way that requires that distributors take careful account of the
specified copyright requirements.
stable/contrib/
This directory contains packages which are DFSG-free and freely
distributable themselves, but somehow depend on a package that is not
freely distributable and thus available only in the non-free section.
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How do I set up my own apt-able repository?
If you have built some private Debian packages which you'd like to install using
the standard Debian package management tools, you can set up your own apt-able
package archive. This is also useful if you'd like to share your Debian packages
while these are not distributed by the Debian project. Instructions on how to do
this are given in the Debian Repository HOWTO.
http://www.debian.org/doc/manuals/repository-howto/repository-howto