diff --git a/slave.mk b/slave.mk
index e1f4a0ef80d9..7cdee954ad73 100644
--- a/slave.mk
+++ b/slave.mk
@@ -736,13 +736,13 @@ $(SONIC_INSTALL_DEBS) : $(DEBS_PATH)/%-install : .platform $$(addsuffix -install
 		# put a lock here because dpkg does not allow installing packages in parallel
 		if mkdir $(DEBS_PATH)/dpkg_lock &> /dev/null; then
 ifneq ($(CROSS_BUILD_ENVIRON),y)
-			{ sudo DEBIAN_FRONTEND=noninteractive dpkg -i $(DEBS_PATH)/$* $(LOG) && rm -d $(DEBS_PATH)/dpkg_lock && break; } || { rm -d $(DEBS_PATH)/dpkg_lock && sudo lsof /var/lib/dpkg/lock-frontend && ps aux && exit 1 ; }
+			{ sudo DEBIAN_FRONTEND=noninteractive dpkg -i $(DEBS_PATH)/$* $(LOG) && rm -d $(DEBS_PATH)/dpkg_lock && break; } || { set +e; rm -d $(DEBS_PATH)/dpkg_lock; sudo lsof /var/lib/dpkg/lock-frontend; ps aux; exit 1 ; }
 else
 			# Relocate debian packages python libraries to the cross python virtual env location
 			{ sudo DEBIAN_FRONTEND=noninteractive dpkg -i $(if $(findstring $(LINUX_HEADERS),$*),--force-depends) $(DEBS_PATH)/$* $(LOG) && \
 			rm -rf tmp && mkdir tmp && dpkg -x $(DEBS_PATH)/$* tmp && (sudo cp -rf tmp/usr/lib/python2*/dist-packages/* $(VIRTENV_LIB_CROSS_PYTHON2)/python2*/site-packages/ 2>/dev/null || true) && \
 			(sudo cp -rf tmp/usr/lib/python3/dist-packages/* $(VIRTENV_LIB_CROSS_PYTHON3)/python3.*/site-packages/ 2>/dev/null || true) && \
-			rm -d $(DEBS_PATH)/dpkg_lock && break; } || { rm -d $(DEBS_PATH)/dpkg_lock && sudo lsof /var/lib/dpkg/lock-frontend && ps aux && exit 1 ; }
+			rm -d $(DEBS_PATH)/dpkg_lock && break; } || { set +e; rm -d $(DEBS_PATH)/dpkg_lock; sudo lsof /var/lib/dpkg/lock-frontend; ps aux; exit 1 ; }
 endif
 		fi
 		sleep 10