diff --git a/cluster/apt.check.update.sh b/cluster/apt.check.update.sh
index 3fa5b75..887464b 100755
--- a/cluster/apt.check.update.sh
+++ b/cluster/apt.check.update.sh
@@ -64,29 +64,33 @@ debug_message() {                                               # {{{
 # }}}
 define_vars() {                                                 # {{{
 
-	## If sge_hostname wasn't defined (environment variable,…)
+	## If sge_hostname wasn't defined (environment variable,…) {{{
 	if [ -z "${sge_hostname}" ]; then
 		## Use local host for sge_hostname
 		sge_hostname="$(hostname -f)"
 	fi
+	## }}}
 
-	## If sge_master_uri wasn't defined (environment variable,…)
+	## If sge_master_uri wasn't defined (environment variable,…) {{{
 	if [ -z "${sge_master_uri}" ]; then
 		## Use local host for sge_master_uri
 		sge_master_uri="physix-master.ipr.univ-rennes1.fr"
 	fi
+	## }}}
 
-	## If sge_master_port wasn't defined (environment variable,…)
+	## If sge_master_port wasn't defined (environment variable,…) {{{
 	if [ -z "${sge_master_port}" ]; then
 		## Use local host for sge_master_port
 		sge_master_port="6444"
 	fi
+	## }}}
 
-	## If EMPTY_ONLY_MODE wasn't defined (argument, environment variable,…)
+	## If EMPTY_ONLY_MODE wasn't defined (argument, environment variable,…) {{{
 	if [ -z "${EMPTY_ONLY_MODE}" ]; then
 		### Set False by default
 		EMPTY_ONLY_MODE="1"
 	fi
+	## }}}
 
 	## Script used to disable SGE queue(s)
 	sge_disable_host_queue_script="${PROGDIR}/sge.disable.host.queue.sh"
@@ -96,6 +100,9 @@ define_vars() {                                                 # {{{
 		| grep --max-count=1 -- "'slots_used'" \
 		| sed 's;.*<queuevalue.*>\(.*\)</queuevalue>;\1;')
 
+	## SGE queues state file
+	cluster_dir="/opt/ipr/cluster"
+	sge_queue_flag_pattern="${cluster_dir}/.sge.*.disable"
 }
 # }}}
 is_sge_host() {                                                 # {{{
@@ -253,6 +260,16 @@ main() {                                                        # {{{
 		&& exit 0
 	## }}}
 
+	## If SGE flag files already exists {{{
+	### Check if APT package upgrade is available
+	### Create APT temp file
+	### AND Exit
+	is_file_present "${sge_queue_flag_pattern}" \
+		&& is_apt_upgrade_present \
+		&& touch "${APT_TMP_FILE}" && echo "APT upgrade is available." >> "${APT_TMP_FILE}" \
+		&& exit 0
+	## }}}
+
 	## If EMPTY_ONLY_MODE is set {{{
 	### Verify empty slots
 	### OR Exit
@@ -265,7 +282,7 @@ main() {                                                        # {{{
 	## }}}
 
 	## If APT package upgrade is available {{{
-	### Create a temp file
+	### Create APT temp file
 	### Disable SGE queue
 	### AND Exit
 	is_apt_upgrade_present \