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+====== Aptitude Undo Operation ======
+While in the Aptitude interactive mode, what can you do to undo an accidentally operation. For e.g. a press of the minus key on a large package group!  Aptitude does now allow you do perform a mass undo of the action you just initiated. To undo do the following:
+<code bash>
+# First Quit aptitude interface
+#
+# Backup current pkgstates file
+cp /var/lib/aptitude/pkgstates /tmp/
+#
+# Replace with copy
+cp /var/backups/aptitude.pkgstates.0 /var/lib/aptitude/pkgstates
+</code>