This upgrade from lenny to squeeze is not more complexer then the update from etch to lenny.
If you read everything carefully your server will run after upgrade too:)

Before you go on please read the official Debian release notes:

Recording your session:

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script -t 2>~/upgrade-squeezestep.time -a ~/upgrade-squeezestep.script

First you should update your running system:

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aptitude update && aptitude dist-upgrade

Check the package state:

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dpkg --audit

It will show any packages which have a status of Half-Installed or Failed-Config, and those with any error status.

If you had a kernel upgrade please reboot. After successfully updates replace the sources from lenny to squeeze:
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