diff --git a/engine/install/ubuntu.md b/engine/install/ubuntu.md
index 67cef06c0b..d84610e2b6 100644
--- a/engine/install/ubuntu.md
+++ b/engine/install/ubuntu.md
@@ -195,6 +195,7 @@ a new file each time you want to upgrade Docker.
     image.
 
     ```console
+    $ sudo service docker start
     $ sudo docker run hello-world
     ```