--- a/99iusupgrade	Fri Apr 29 16:34:44 2011 +0200
+++ b/99iusupgrade	Wed Jun 08 15:56:23 2011 +0200
@@ -1,6 +1,6 @@
 DPkg {
   Pre-Invoke {
-    "wc -l < /var/log/apt/history.log > /tmp/lines_count.dat";
+    "wc -l < /var/log/apt/history.log > /tmp/lines_count.dat || true";
   };
   Post-Invoke {
     "test -x /usr/sbin/apt-feed-logbuch && /usr/sbin/apt-feed-logbuch $(echo $PPID) || true";