Upgrade Debian squeeze to wheezy

Attention this tutorial was written for ARM-Based systems in my case it was a Trim-Slice system, without MBR (without grub). It was a plain Debian without Kernel and boot loader

sed -i "s,squeeze,wheezy,g" /etc/apt/sources.list
cat /etc/apt/sources.list
deb http://ftp.de.debian.org/debian/ wheezy main
deb-src http://ftp.de.debian.org/debian/ wheezy main
deb http://security.debian.org/ wheezy/updates main
deb-src http://security.debian.org/ wheezy/updates main
# wheezy-updates, previously known as 'volatile'
deb http://ftp.de.debian.org/debian/ wheezy-updates main
deb-src http://ftp.de.debian.org/debian/ wheezy-updates main

Dont forget a proxy;)

export http_proxy=http://proxy.debianuser.org:8080/

Update all sources:

apt-get update

Start the minimalistic upgrade

apt-get upgrade

Upgrade udev:

apt-get install udev
apt-get dist-upgrade

Thats all =) reboot your ARM-box and enjoy a new version of Debian.

UPDATE: 27.01.2013

This Upgrade step by step lines are tested on production X64-Debian Systems running with Debian-Kernel.

Be sure you your squeeze system is uptodate!

sed -i "s,squeeze,wheezy,g" /etc/apt/sources.list
apt-get update
apt-get upgrade
dpkg -l | grep linux-image
apt-get install linux-image-2.6-amd64
apt-get install udev

System reboot; after reboot continue with

apt-get dist-upgrade

Clean a Kbit:

apt-get autoremove && apt-get clean

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