sudo is missing and root password is unknown?

On Command Prompt call:

$ lxrun /setdefaultuser root

When now starting the bash with

$ bash

the user is root and the password can be changed with

$ passwd

How to switch between distributions with WSL-Distribution-Switcher?

To list all installed distribution call:

$ python switch.py

To switch between them call:

$ python switch.py image[:tag]

To install a downloaded image call:

$ python install.py image[:tag] | tarball | squashfs

To download a new image call:

$ python get-source.py image[:tag]

A list of images can be found at get-source.py.

A tool to switch between distributions is WSL-Distribution-Switcher.

It needs Pythin 3.0 and comes with tools to download, install and switch distributions.

Turn on Developer Mode:
- Open Settings -> Update and Security -> For developers
- Select the Developer Mode radio button
Enable the Windows Subsystem for Linux feature:
- From Start, search for “Turn Windows features on or off” (type ‘turn’)
- Select Windows Subsystem for Linux (beta)

Enable the Windows Subsystem for Linux feature (command-line)

$ Enable-WindowsOptionalFeature -Online -FeatureName Microsoft-Windows-Subsystem-Linux

The installation location is %localappdata%\lxss\

See MSDN.