Upgrade from Lenny to Squeeze

1)  Update /etc/apt/source.list

deb http://ftp.de.debian.org/debian/ squeeze main
deb-src http://ftp.de.debian.org/debian/ squeeze main

deb http://ftp.us.debian.org/debian/ squeeze main
deb-src http://ftp.us.debian.org/debian/ squeeze main


2) update local package database
>sudo aptitude update


3) update package management
>sudo aptitude install apt dpkg aptitude

4) update kernel image
>sudo aptitude install linux-image-2.6-686

5) reboot computer and start with new kenerl 2.6.32
6) update all packages
>sudo aptitude full-upgrade


Reference:

• http://forums.debian.net/viewtopic.php?f=10&t=46119
• http://www.go2linux.org/how-to-upgrade-from-debian-lenny-to-squeeze