Upgrading from Debian Lenny to Debian Squeeze
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KDE 4 applications on Debian Lenny use ~/.kde4 directory to store user settings
and data. However, this has changed in Debian Squeeze. Once kdelibs5 package is
upgraded (or multiple new lib* packages repace it), all newly started KDE 4
applications will switch to using ~/.kde directory for this purpose.

In order to avoid data loss, you should make sure there are no KDE 4
applications running when upgrading. It is also recommended to terminate all
running KDE sessions first.

You may use Kaboom, the Debian KDE Settings Migration Wizard, to migrate your
old KDE 4 settings to a new location. The wizard also features backing up of
exising KDE settings to protect your data if something goes wrong with upgrade.
Please refer to http://pkg-kde.alioth.debian.org/kaboom.html for more
information.

Kaboom will start automatically when you start a KDE 4 session for the first
time after upgrade from KDE 3.5 desktop shipped with Debian Lenny. However, if
you only use individual KDE 4 applications, you will need to run Kaboom
manually. Executable is named 'kaboom' and it is included in the kaboom
package.