When starting a WSL distribution for the first time, a text prompt for user name and password appears: The code for that is partially in the Windows launcher. The Windows side actually prompts for the user name: https://github.com/microsoft/WSL-DistroLauncher/blob/master/DistroLauncher/DistroLauncher.cpp#L44 and passes it to ‘adduser’: https://github.com/microsoft/WSL-DistroLauncher/blob/1f8551f7e2ea22bba2e6fb02f01e7a5f7fb757f3/DistroLauncher/DistributionInfo.cpp#L14 That seems to be a Debian specific tool that also prompts …]