Installing postgresql on Debian Lenny-->my /etc/apt/sources.list.

Dear my friends,

I want to install PostgreSQL in my Debian Lenny box.

I can't install PostgreSQL with aptitude:
"
aptitude install postgresql
".

It seems that the aptitude can not find the postgresql.

This is my '/etc/apt/sources.list'.

I have done "aptitude update" too. And it was completed properly.

Please tell me what is my mistake.

Thank you very much in advance.

===

deb http://security.debian.org/ stable/updates main contrib
deb ftp://packages.debian.org/debian/ stable main contrib non-free
deb-src ftp://packages.debian.org/debian/ stable main contrib non-free

deb http://kambing.ui.edu/debian/ stable main contrib non-free
deb http://kambing.ui.edu/debian-security/ stable/updates main contrib
non-free deb-src http://kambing.ui.edu/debian/ stable main contrib
non-free deb-src http://kambing.ui.edu/debian-security/ stable/updates
main contrib non-free

deb http://security.debian.org/ testing/updates main contrib
deb ftp://packages.debian.org/debian/ testing main contrib non-free
deb-src ftp://packages.debian.org/debian/ testing main contrib non-free

deb http://kambing.ui.edu/debian/ testing main contrib non-free
deb http://kambing.ui.edu/debian-security/ testing/updates main contrib
non-free deb-src http://kambing.ui.edu/debian/ testing main contrib
non-free deb-src http://kambing.ui.edu/debian-security/ testing/updates
main contrib non-free