diff --git a/xCAT-server/debian/postinst b/xCAT-server/debian/postinst
index 3a87d05c5..5bbbe0d08 100644
--- a/xCAT-server/debian/postinst
+++ b/xCAT-server/debian/postinst
@@ -32,7 +32,13 @@ case "$1" in
 	    fi
 	fi
 	ln -sf /opt/xcat/sbin/xcatd /usr/sbin/xcatd
-	
+    #SHA1 has been get rid of after Squeeze released. Its functionality is also provided by Digest::SHA (which is in core).
+    #but ipmi.pm need SHA1.pm, so create this link
+    shalocate=`find / -name "SHA.pm"`
+    shalocate=${shalocate%SHA.pm}
+    cd $shalocate
+    ln -s SHA.pm SHA1.pm
+    cd -
     ;;
 
     abort-upgrade|abort-remove|abort-deconfigure)