Update 8.7-to-8.8.md

doc/update/8.7-to-8.8.md

@@ -127,6 +127,10 @@ via [/etc/default/gitlab].
 Ensure you're still up-to-date with the latest init script changes:
 
     sudo cp lib/support/init.d/gitlab /etc/init.d/gitlab
+    
+For Ubuntu 16.04.1 LTS:
+
+    sudo systemctl daemon-reload
 
 ### 8. Start application