diff --git a/xCAT-server/share/xcat/tools/go-xcat b/xCAT-server/share/xcat/tools/go-xcat
index 794355cef..01419fa6c 100755
--- a/xCAT-server/share/xcat/tools/go-xcat
+++ b/xCAT-server/share/xcat/tools/go-xcat
@@ -2,7 +2,7 @@
 #
 # go-xcat - Install xCAT automatically.
 #
-# Version 1.0.3
+# Version 1.0.5
 #
 # Copyright (C) 2016 International Business Machines
 # Eclipse Public License, Version 1.0 (EPL-1.0)
@@ -136,14 +136,7 @@ GO_XCAT_DEFAULT_BASE_URL="http://xcat.org/files/xcat/repos"
 GO_XCAT_DEFAULT_INSTALL_PATH="/install/xcat"
 
 # The package list of xcat-core
-GO_XCAT_CORE_PACKAGE_LIST=(perl-xCAT xCAT xCAT-SoftLayer xCAT-buildkit
-	xCAT-client xCAT-confluent xCAT-genesis-scripts-ppc64
-	xCAT-genesis-scripts-x86_64 xCAT-server xCAT-test xCAT-vlan xCATsn)
-# For Debian/Ubuntu, it will need a sight different package list
-type dpkg >/dev/null 2>&1 &&
-GO_XCAT_CORE_PACKAGE_LIST=(perl-xcat xcat xcat-buildkit xcat-client
-	xcat-confluent xcat-genesis-scripts-amd64 xcat-genesis-scripts-ppc64
-	xcat-server xcat-test xcat-vlan xcatsn)
+GO_XCAT_CORE_PACKAGE_LIST=()
 GO_XCAT_DEP_PACKAGE_LIST=()
 
 # The package list of all the packages should be installed
@@ -293,7 +286,7 @@ function internal_cleanup()
 #
 function custom_setup()
 {
-	check_exec_or_exit awk cat printf sort sleep tee
+	check_exec_or_exit awk cat comm printf sleep tee
 	check_root_or_exit
 }
 
@@ -1168,12 +1161,12 @@ function update_xcat()
 {
 	local -i i=0
 	local ver=""
+	local -a xcat_core_package_list
+	xcat_core_package_list=($(get_package_list xcat-core))
+	exit_if_bad "$?" "Fail to get package list from repository 'xcat-core'."
 	local -a install_list=($(
-	for p in "${GO_XCAT_INSTALL_LIST[@]}" \
-		$(get_package_list xcat-core)
-	do
-		echo "${p}"
-	done | sort -u
+		comm <(echo "${GO_XCAT_INSTALL_LIST[@]}") \
+			<(echo "${xcat_core_package_list[@]}")
 	))
 	for i in "${!install_list[@]}"
 	do
@@ -1186,14 +1179,10 @@ function update_xcat()
 
 function list_xcat_packages()
 {
-	GO_XCAT_CORE_PACKAGE_LIST=($(
-	for p in "${GO_XCAT_CORE_PACKAGE_LIST[@]}" \
-		$(get_package_list xcat-core)
-	do
-		echo "${p}"
-	done | sort -u
-	))
+	GO_XCAT_CORE_PACKAGE_LIST=($(get_package_list xcat-core))
+	exit_if_bad "$?" "Fail to get package list from repository 'xcat-core'."
 	GO_XCAT_DEP_PACKAGE_LIST=($(get_package_list xcat-dep))
+	exit_if_bad "$?" "Fail to get package list from repository 'xcat-dep'."
 
 	local -i cols="$(type tput >/dev/null 2>&1 && tput cols)"
 	[[ "${cols}" -lt 80 ]] && cols=80
@@ -1484,9 +1473,9 @@ echo
 echo -n "Reading repositories "
 show_progress_meters
 ERR_MSG="$({
-	if add_xcat_core_repo "${GO_XCAT_YES[@]}" "${GO_XCAT_CORE_URL}" "${GO_XCAT_VERSION}"
+	if add_xcat_core_repo -y "${GO_XCAT_CORE_URL}" "${GO_XCAT_VERSION}"
 	then
-		if add_xcat_dep_repo "${GO_XCAT_YES[@]}" "${GO_XCAT_DEP_URL}"
+		if add_xcat_dep_repo -y "${GO_XCAT_DEP_URL}"
 		then
 			update_repo && exit 0
 			remove_repo "xcat-dep"
@@ -1524,15 +1513,13 @@ case "${GO_XCAT_ACTION}" in
 			exit 0
 		esac
 	fi
-	(
-		# Use `-y' here. Since the STDOUT is redirect to tee.
-		# `yum' does not display the prompt message properly when
-		# working with tee.
-		"${GO_XCAT_INSTALLER}" -y 2>&1 1>&42 |
-			tee "${TMP_DIR}/${GO_XCAT_INSTALLER}.stderr" >&2
-		exit "${PIPESTATUS[0]}"
-	) 42>&1 | tee "${TMP_DIR}/${GO_XCAT_INSTALLER}.stdout"
-	RET="${PIPESTATUS[0]}"
+	# Use `-y' here. Since the STDOUT is redirect to tee.
+	# `yum' does not display the prompt message properly when
+	# working with tee.
+	"${GO_XCAT_INSTALLER}" -y \
+		> >(tee "${TMP_DIR}/${GO_XCAT_INSTALLER}.stdout") \
+		2> >(tee "${TMP_DIR}/${GO_XCAT_INSTALLER}.stderr" >&2)
+	RET="$?"
 	{
 		# Creating logs
 		echo "-- 8< -- -- -- -- -- -- -- -- -- -- -- -- -- -- --"