diff --git a/xCAT-server/share/xcat/install/scripts/post.ubuntu b/xCAT-server/share/xcat/install/scripts/post.ubuntu
index d8f948fe7..80a6ea669 100755
--- a/xCAT-server/share/xcat/install/scripts/post.ubuntu
+++ b/xCAT-server/share/xcat/install/scripts/post.ubuntu
@@ -32,7 +32,7 @@ done >>/etc/resolv.conf
 ln -sf /bin/bash /bin/sh
 #
 #delete the useless apt repo
-sed -i 's/^deb.*updates.*$/#&/g' /etc/apt/sources.list
+#sed -i 's/^deb.*updates.*$/#&/g' /etc/apt/sources.list
 # Run xCAT post install
 #
 export MASTER_IP="#XCATVAR:XCATMASTER#"
@@ -230,9 +230,9 @@ script
 end script
 EOF
 fi
-sed -i 's/\(deb.*security.*\)/#\1/' /etc/apt/sources.list
+#sed -i 's/\(deb.*security.*\)/#\1/' /etc/apt/sources.list
 #iso does not contains source deb packages
-sed -i 's/^\(\s*deb-src.*install.*\)$/#\1/g' /etc/apt/sources.list
+#sed -i 's/^\(\s*deb-src.*install.*\)$/#\1/g' /etc/apt/sources.list
 #delete the 127.0.1.1 line from /etc/hosts
 sed -i '/127.0.1.1/d' /etc/hosts
 updateflag.awk $MASTER 3002
diff --git a/xCAT-server/share/xcat/install/ubuntu/compute.tmpl b/xCAT-server/share/xcat/install/ubuntu/compute.tmpl
index 7f12d69cd..a0d3fa0cc 100644
--- a/xCAT-server/share/xcat/install/ubuntu/compute.tmpl
+++ b/xCAT-server/share/xcat/install/ubuntu/compute.tmpl
@@ -100,7 +100,7 @@ tasksel tasksel/first multiselect standard
 
 d-i pkgsel/include string #INCLUDE_DEFAULT_PKGLIST_PRESEED#
 
-d-i debian-installer/allow_unauthenticated string true
+d-i debian-installer/allow_unauthenticated boolean true
 d-i pkgsel/update-policy select none
 d-i pkgsel/updatedb boolean false
 
diff --git a/xCAT-server/share/xcat/install/ubuntu/service.tmpl b/xCAT-server/share/xcat/install/ubuntu/service.tmpl
index 8e7cbac67..ca87469ee 100644
--- a/xCAT-server/share/xcat/install/ubuntu/service.tmpl
+++ b/xCAT-server/share/xcat/install/ubuntu/service.tmpl
@@ -100,7 +100,7 @@ tasksel tasksel/first multiselect standard
 
 d-i pkgsel/include string #INCLUDE_DEFAULT_PKGLIST_PRESEED#
 
-d-i debian-installer/allow_unauthenticated string true
+d-i debian-installer/allow_unauthenticated boolean true
 d-i pkgsel/update-policy select none
 d-i pkgsel/updatedb boolean false