diff -Nru ubiquity-2.2.18/debian/changelog ubiquity-2.2.19/debian/changelog
--- ubiquity-2.2.18/debian/changelog	2010-04-16 15:28:21.000000000 +0100
+++ ubiquity-2.2.19/debian/changelog	2010-04-19 09:03:50.000000000 +0100
@@ -1,3 +1,10 @@
+ubiquity (2.2.19) lucid; urgency=low
+
+  * Use allow_change_step(False) from the KDE portions of the partman
+    component when necessary (LP: #563309).
+
+ -- Evan Dandrea <evand@ubuntu.com>  Mon, 19 Apr 2010 09:03:48 +0100
+
 ubiquity (2.2.18) lucid; urgency=low
 
   [ Evan Dandrea ]
diff -Nru ubiquity-2.2.18/ubiquity/frontend/kde_components/PartMan.py ubiquity-2.2.19/ubiquity/frontend/kde_components/PartMan.py
--- ubiquity-2.2.18/ubiquity/frontend/kde_components/PartMan.py	2010-03-31 19:17:27.000000000 +0100
+++ ubiquity-2.2.19/ubiquity/frontend/kde_components/PartMan.py	2010-04-16 18:48:30.000000000 +0100
@@ -202,6 +202,7 @@
 
             mountpoint = unicode(self.create_dialog.partition_create_mount_combo.currentText())
 
+            self.ctrlr.allow_change_step(False)
             self.ctrlr.dbfilter.create_partition(
                 devpart,
                 str(self.create_dialog.partition_create_size_spinbutton.value()),
@@ -333,6 +334,7 @@
 
             if (size is not None or method is not None or fmt is not None or
                 mountpoint is not None):
+                self.ctrlr.allow_change_step(False)
                 edits = {'size': size, 'method': method,
                          'mountpoint': mountpoint}
                 if fmt is not None:
@@ -410,6 +412,7 @@
         devpart, partition = self.get_treeview_data()
         if not devpart or not partition:
             return
+        self.ctrlr.allow_change_step(False)
         self.ctrlr.dbfilter.create_label(devpart)
 
     def on_new_clicked(self):
@@ -430,6 +433,7 @@
         devpart, partition = self.get_treeview_data()
         if not devpart or not partition:
             return
+        self.ctrlr.allow_change_step(False)
         self.ctrlr.dbfilter.delete_partition(devpart)
 
     def on_undo_clicked(self):