11. APT Aptitude $ sudo apt-get install apache2 main contrib
non-free $sudo vi /etc/apt/source.lists deb
http://cdn.debian.net/debian/ squeeze main contrib non-free deb
http://cdn.debian.net/debian/ squeeze-updates main contrib deb
http://cdn.debian.net/debian/ squeeze main contrib non-free
12. Security Tracker
https://security-tracker.debian.org/tracker/ Debian Security
Announce http://www.debian.org/security/#DSAS $ sudo vi
/etc/apt/sources.list deb http://security.debian.org/
squeeze/updates main contrib non-free Common Vulnerabilities and
Exposures http://cve.mitre.org/cve/ Debian Bug Report
http://bugs.debian.org/cgi-bin/pkgreport.cgi?dist=unstable;package=apache2