Debian has released a stable version of Debian 6.0 (squeeze). If you're running previous version of Debian, you can easily upgrade.
1. Update all packages currently installed to the latest lenny versions
# apt-get update # apt-get upgrade
2. Replace all occurrences of lenny with squeeze in the apt sources file (pico /etc/apt/sources.list). Here's an example of what the file could look like after the change:
deb http://ftp.br.debian.org/debian/ squeeze main deb-src http://ftp.br.debian.org/debian/ squeeze main deb http://security.debian.org/ squeeze/updates main deb-src http://security.debian.org/ squeeze/updates main # squeeze-updates, previously known as 'volatile' deb http://ftp.br.debian.org/debian/ squeeze-updates main deb-src http://ftp.br.debian.org/debian/ squeeze-updates main
3. Update apt repository
# apt-get update
4. Upgrade apt, dpkg and aptitude packages first
apt-get install apt dpkg aptitude
5. Do a dist-upgrade to upgrade the rest of the system
# apt-get dist-upgrade
6. Reboot
# reboot
7. Check the debian version
# cat /etc/debian_version
It should read version 6.0.0 or greater