--- a/debian-apt.rst	Tue Feb 12 10:35:56 2013 +0200
+++ b/debian-apt.rst	Tue Feb 12 10:38:18 2013 +0200
@@ -9,15 +9,38 @@
 Conf files.
 ===========
 
-See man sources.list(5), apt.conf(5)::
+See man sources.list(5), apt.conf(5), apt_preferences(5).
+
+``/etc/apt/sources.list``::
+
+  deb http://ftp.debian.org.ua/debian/ stable main contrib non-free
+  deb http://ftp2.debian.org.ua/debian/ testing main contrib non-free
+  deb http://ftp2.debian.org.ua/debian/ unstable main contrib non-free
+  deb http://ftp.uk.debian.org/debian/ experimental main contrib non-free
+  deb http://www.deb-multimedia.org testing main non-free
+
+``/etc/apt/preferences``::
 
-  /etc/apt/sources.list
-  /etc/apt/apt.conf
+  Package: *
+  Pin: release a=stable
+  Pin-Priority: 800
+
+  Package: *
+  Pin: release a=testing
+  Pin-Priority: 900
+
+  Package: *
+  Pin: release a=unstable
+  Pin-Priority: 700
+
+  Package: *
+  Pin: release a=experimental
+  Pin-Priority: 600
 
 Setup backport.
 ===============
 
-Main backports archive you can find on www.backports.org.
+Main backports archive located at http://www.backports.org.
 
 To get packeges gpg sign key::
 
@@ -29,9 +52,6 @@
 Write where packeges places::
 
   $ cat /etc/apt/sources.list
-  deb cdrom:[Debian GNU/Linux 4.0 r0 _Etch_ - Official amd64 DVD Binary-2 20070407-12:15]/ etch contrib main
-  deb cdrom:[Debian GNU/Linux 4.0 r0 _Etch_ - Official amd64 DVD Binary-1 20070407-12:15]/ etch contrib main
-
   deb http://www.backports.org/debian/ etch-backports main contrib non-free
 
 Getting new keys for packages.

--- a/virtualization.rst	Tue Feb 12 10:35:56 2013 +0200
+++ /dev/null	Thu Jan 01 00:00:00 1970 +0000
@@ -1,11 +0,0 @@
--*- mode: outline; coding: utf-8; -*-
-
-* VirtualBox.
-
-x86 virtualization solution.
-
-In Debian Etch use backport repo.
-
-  $ sudo apt-get install virtualbox-ose
-
-