Update 8.0-to-8.1.md

doc/update/8.0-to-8.1.md

@@ -100,6 +100,10 @@ sudo -u git -H bundle exec rake assets:clean assets:precompile cache:clear RAILS
 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
 
 #### New configuration options for `gitlab.yml`