====== Debian Distribution Upgrade - Squeeze to Wheezy ======

===== 0. foreword =====

The source of this tutorial is sysadminslife.com((http://www.sysadminslife.com/linux/howto-upgrade-debian-6-squeeze-zu-debian-7-wheezy/)) and describes the update process in a compact form.

===== 1. create a data backup =====

Before you start the update, you should definitely start a data backup. Ideally, create a snapshot or a hard disc image. (I will not go into the procedure here)

===== 2. display the current Debian version =====

<code bash>	
cat /etc/debian_version
6.0.7
</code>

===== 3. update packages =====

<code bash>	
apt-get update
apt-get upgrade
apt-get dist-upgrade
</code>

===== 4. customise the sources.list =====

Adapt the file /etc/apt/sources.list as follows (if there are entries from third-party providers, these must also be updated):

<code text>	
deb http://ftp.at.debian.org/debian/ wheezy main
deb-src http://ftp.at.debian.org/debian/ wheezy main
 
deb http://security.debian.org/ wheezy/updates main
deb-src http://security.debian.org/ wheezy/updates main
 
deb http://ftp.at.debian.org/debian/ wheezy-updates main
deb-src http://ftp.at.debian.org/debian/ wheezy-updates main
</code>

===== 5. run the minimal update =====

<code bash>	
apt-get update
apt-get upgrade
</code>

===== 6. kernel update =====

List the current kernel:

<code bash>	
dpkg -l | grep linux-image
</code>

Sample output:

<code bash>	
ii  linux-image-2.6-amd64        2.6.32+29   Linux 2.6 for 64-bit PCs (meta-package)
ii  linux-image-2.6.32-5-amd64   2.6.32-41   Linux 2.6.32 for 64-bit PCs
</code>

Here you have to remember the meta designation (amd64 or 686):

<code bash>	
apt-get install linux-image-2.6-amd64
</code>

===== 7. manual grub update =====

<code bash>	
update-grub
</code>

===== 8. manual udev update =====

<code bash>	
apt-get install udev
</code>

===== 9. start complete update =====

<code bash>	
apt-get dist-upgrade
</code>

===== 10. display Debian version =====

<code bash>	
cat /etc/debian_version
7.0
</code>

===== 11. reboot =====

<code bash>
shutdown -r now
</code>

===== 12. rework =====

Be sure to check the error logs!