DOCS-4696: Remove old note about Ubuntu <=9.10

Author: i80and

source/tutorial/install-mongodb-on-debian.txt

@@ -7,17 +7,9 @@ Install MongoDB on Debian
 Overview
 --------
 
-Use this tutorial to install MongoDB on Debian systems from
-``.deb`` packages. While some Debian distributions include
-their own MongoDB packages, the official MongoDB packages are generally
-more up to date.
-
-.. note::
-
-   This tutorial applies to both Debian systems and versions of Ubuntu
-   Linux prior to 9.10 "Karmic" which do not use Upstart. Other Ubuntu
-   users will want to follow the :doc:`/tutorial/install-mongodb-on-ubuntu`
-   tutorial.
+Use this tutorial to install MongoDB from ``.deb`` packages on the current
+**stable** Debian release. While Debian includes its own MongoDB packages, the
+official MongoDB packages are more up to date.
 
 .. The following include includes two h2 headers:
 .. Packages and Control Scripts