lead to uninstallable packages or wrong decisions while upgrading packages.
Even more problems will arise if multiply distribution releases are mixed
without a good understanding of the following paragraphs.
+Packages included in a specific release aren't tested in and
+therefore doesn't always work as expected in older or newer releases or
+together with other packages from different releases.
You have been warned.</para>
<para>Note that the files in the <filename>/etc/apt/preferences.d</filename>