#### Start Ubuntu Xenial container

`$ docker container run -d -it --name my_ubuntu ubuntu:xenial`

#### Inside Ubuntu container, update and install CURL
**Note:** make sure the DNS works fine in the container.

<pre>
root@9b7xxx:/# apt update
root@9b7xxx:/# apt install curl
</pre>

You can use 'Ctrl+pq' to exit the container without stopping it cause the CMD is running '/bin/bash' by default.

#### Reattach to the container

`$ docker container attach my_ubuntu`