Update 8.0-to-8.1.md

doc/update/8.0-to-8.1.md

@@ -99,6 +99,10 @@ sudo -u git -H bundle exec rake assets:clean assets:precompile cache:clear RAILS
 # Update init.d script
 sudo cp lib/support/init.d/gitlab /etc/init.d/gitlab
 ```
+    
+For Ubuntu 16.04.1 LTS:
+
+    sudo systemctl daemon-reload
 
 ### 7. Update configuration files