Work on doc.

README.md

@@ -7,8 +7,8 @@ The basic idea is that the developer has his own Linux Ubuntu ROS
 installation and then either check out publicly available ROS package repos or
 use docker to get access to the software that is not publicly available.
 
-- [Prepare Existing ROS Computer](doc/prepare_ros_computer.md)
 - [Getting the Docker Image](https://gitlab.liu.se/lrs/waraps_docker_images)
+- [Prepare Existing ROS Computer](doc/prepare_ros_computer.md)
 - [Install Software on Local Machine or Virtual Machine](doc/install.md)
 - [Local ROS Installation and LRS Docker Modules](doc/local_ros_installation.md)
 - [Minimal Dockers](doc/minimal_dockers.md) (WORK IN PROGRESS)

doc/prepare_ros_computer.md

 # Prepare Existsing Computer
 
-If you already have a ROS computer with a docker daeamon running you can do:
-
-## Install Docker
-
-See [docker_linux.md]() for installation instruction for Ubuntu 18.04 and 20.04.
-
+If you already have a ROS computer with a docker daeamon follow the
+instructions below.
 
 ## Configuring Development Computer