I found the Ubuntu app button in Microsoft App Store and attached it. There were limited instructions: I had Microsoft Windows help with their side. Ubuntu did not boot up as option. Windows 10 S booted again, but I had a Linux command window. That's it.
Below are instructions from the official Get Ubuntu 18.04 – Microsoft Store website.
To launch, use "ubuntu1804" on the command line prompt (cmd.exe), or click on the Ubuntu icon tile in the Windows 10 Start menu.
To use this feature, one first needs to use "Turn Windows features on or off" and select "Windows Subsystem for Linux", click OK, reboot, and use this app.
Over 214MB of data was installed when I clicked on the Ubuntu icon.
Then I opened the Windows command prompt window and typed ubuntu 1804, but nothing happened. My Windows Command Prompt results are shown below.
C:\Users\phoebedavis>UBUNTU 1804'UBUNTU' is not recognized as an internal or external command,operable program or batch file.C:\Users\phoebedavis>Can someone assist this totally new noob? I want to run Ubuntu in Windows Subsystem for Linux in Windows 10 S before buying multiple single board computers and installing Ubuntu on them as workstations.