====== Upgrading Lenny to Squeeze ======

===== Last Lenny upgrade =====

<file>
apt-get update
apt-get upgrade
apt-get dist-upgrade
</file>

Falls beim Upgrade die Fehlermeldung “The following packages have been kept back” auftaucht findet ihr hier die Lösung.
Den neuen Paket-Mirror eintragen:

===== Change Sources =====

Dazu ändern wir die Datei sources.list, die Ihr bei der Standardinstallation unter /etc/apt/ findet.
Diese Datei könnt ihr mit eurem Lieblingseditor bearbeiten. Ich persönlich verwende hier den “vi”.

<file>
vi /etc/apt/sources.list
</file>

Now we change "lenny" to "squeeze". When finished it should look like.

<file>
deb http://ftp.de.debian.org/debian/ squeeze main non-free contrib
deb-src http://ftp.de.debian.org/debian/ squeeze main non-free contrib

deb http://security.debian.org/ squeeze/updates main non-free contrib
deb-src http://security.debian.org/ squeeze/updates main non-free contrib
</file>

===== Upgrade to Squeeze =====

Start the upgrade:

Update the package lists:

<file>
apt-get update
</file>

Install apt, dpkg and aptitude. Once these packages are installed, it doesn't matter what happens you can recover from just about any errors.

<file>
apt-get install apt dpkg aptitude
</file>

And now the actual upgrade to Squeeze.

<file>
apt-get dist-upgrade
</file>