diff --git a/xCAT-server/share/xcat/install/scripts/pre.ubuntu b/xCAT-server/share/xcat/install/scripts/pre.ubuntu
index aab441536..2a64b2ae8 100644
--- a/xCAT-server/share/xcat/install/scripts/pre.ubuntu
+++ b/xCAT-server/share/xcat/install/scripts/pre.ubuntu
@@ -62,7 +62,7 @@ if [ "\$1" = "install_monitor" ]; then
     cmd=""
     while [ "\$cmd" != "done" ]; do
         read cmd remainder
-    
+
         if [ "\$cmd" == "ready" ]; then
             echo "installmonitor"
         fi
@@ -73,13 +73,13 @@ fi
 
 #
 #  If the script was called with the "installstatus" argument, stdin and stdout are
-#  connected to an xCAT daemon on the master.  
+#  connected to an xCAT daemon on the master.
 #  Write the "installstatus xx" request to the daemon to update thenode installation status.
 if [ "\$1" = "installstatus" ]; then
     cmd=""
     while [ "\$cmd" != "done" ]; do
         read cmd remainder
-    
+
         if [ "\$cmd" == "ready" ]; then
             echo "installstatus \$2"
         fi