Debian upgrade 4 to 5

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Upgrading Debian from version 4 to 5

Simple howto: http://www.cyberciti.biz/tips/howto-upgrade-debian-linux-4etch-to-5lenny-server.html

Long howto: http://www.debian.org/releases/lenny/i386/release-notes/ch-upgrading.en.html

Step from Long howto Notes Status
4.1.1. Back up any data or configuration information We relay on the xen center, here we can make backup of the whole guest. OK
4.1.3. Prepare for recovery We relay on the xen center console (on the host) OK
A.2. Checking your sources list OK
4.2.1. Review actions pending in package manager In the aptitude there was packages scheduled for removal:
Removing dnsutils ...
Removing bind9-host ...
Removing libbind9-0 ...
Removing libisccfg1 ...
Removing libdns22 ...
Removing libisccc0 ...
Removing libisc11 ...
Removing liblwres9 ...
OK
A.1. Upgrading your etch system (update to the latest point release of etch)
apt-get update
...
W: GPG error: http://updates.xensource.com etch Release: 
The following signatures couldn't be verified because 
the public key is not available
apt-get --simulate --show-upgraded
The following packages have been kept back:
 linux-image-2.6-xen
The following packages will be upgraded:
 gzip libaudiofile0 libc6 libc6-dev libexpat1 libkrb53 
 libltdl3 libpq4 libtool locales python2.4
 python2.4-minimal
12 upgraded, 0 newly installed, 0 to remove and 1 not upgraded.
access to updates.xensource.com needs to be fixed
4.2.3. Checking packages status OK
4.2.5.1. Using backports.org packages OK