Draft ADMIN text, covering (first parts of) system upgrade).

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+# Administrating system-wide Debian packages
+
+
+## Tools
+
+  * apt - for interactive simple command-line tasks
+  * apt-get - for scripted tasks
+  * aptitude - for fullscreen browsing and complex tasks
+
+
+## System upgrade
+
+Make sure your current system is up-to-date:
+
+  * Check /etc/apt/sources.list* files that only current release is used.
+  * Update and upgrade:
+
+	apt update; apt upgrade
+
+Make sure that all auto-installed packages are marked as such:
+
+  * Start aptitude in fullscreen mode:
+
+	aptitude -u
+
+  * Check each installed package: Flag as auto-installed as appropriate
+  * Remove no longer used packages as needed (press "g" twice).
+
+Double-check packages unneeded for or alien to current release:
+
+  * Compute package lists:
+
+	localbackuppkglists
+
+  * locate and inspect aliens and explicits below /etc/*/localpkglists.*