diff --git a/xCAT-server/share/xcat/install/scripts/pre.ubuntu b/xCAT-server/share/xcat/install/scripts/pre.ubuntu
index b49e84aae..30ab31a54 100644
--- a/xCAT-server/share/xcat/install/scripts/pre.ubuntu
+++ b/xCAT-server/share/xcat/install/scripts/pre.ubuntu
@@ -94,12 +94,12 @@ chmod 755 /tmp/foo.sh
 if [ -d /sys/firmware/efi ]; then
     echo "ubuntu-efi ::" > /tmp/partitioning
     echo "    512 512 1024 fat16" >> /tmp/partitioning
-    echo "    $iflabel{ gpt } $reusemethod{ } method{ efi } format{ }" >> /tmp/partitioning
+    echo '    $iflabel{ gpt } $reusemethod{ } method{ efi } format{ }' >> /tmp/partitioning
     echo "    ." >> /tmp/partitioning
 else
     echo "ubuntu-boot ::" > /tmp/partitioning
     echo "100 50 100 ext3" >> /tmp/partitioning
-    echo "    $primary{ } $bootable{ } method{ format } format{ } use_filesystem{ } filesystem{ ext3 } mountpoint{ /boot }" >> /tmp/partitioning
+    echo '    $primary{ } $bootable{ } method{ format } format{ } use_filesystem{ } filesystem{ ext3 } mountpoint{ /boot }' >> /tmp/partitioning
     echo "    ." >> /tmp/partitioning
 fi
 echo "500 10000 1000000000 ext3" >> /tmp/partitioning