设想

为了使用 powershell 自动安装和初始化 WSL Ubuntu 18.04，我正在尝试自动初始化/设置第一个用户名和密码。但是，当我第一次从 powershell 命令运行 wsl 时，powershell 会转到 wsl 的 shell，等待用户手动输入密码。

MWE

在 wsl 初始化后，我进行了五次不同的尝试，将用户名、密码（和密码）通过管道传递到输入提示符，这些都包含在以下 MWE 中。

##############Required for MWE###################
# Enable wsl subsystems for linux (if powershell is ran in admin mode)
Enable-WindowsOptionalFeature -Online -FeatureName Microsoft-Windows-Subsystem-Linux

# Set Tls12 protocol to be able to download the wsl application
[Net.ServicePointManager]::SecurityProtocol = [Net.SecurityProtocolType]::Tls12

# check to see if ubuntu1804 installation file exists and download the app otherwise
$fileToCheck = "Ubuntu1804.appx"
if (Test-Path $fileToCheck -PathType leaf) 
{"File does Exist"}
else
{Invoke-WebRequest -Uri https://aka.ms/wsl-ubuntu-1804 -OutFile Ubuntu1804.appx -UseBasicParsing}

# Actually install the wsl ubuntu 18.04 app
Add-AppxPackage .\Ubuntu1804.appx
Write-Output "Installed the ubuntu18.04"

# backup installation command if the first command did not function properly
invoke-expression -Command "Add-AppxPackage .\Ubuntu1804.appx"
Write-Output "Installed the ubuntu with backup attempt"


##############Actual attempts to initialize ubuntu without prompting for user input###################
Write-Host "Trying to initialize ubuntu"
# Attempt 0: makes it start installing the wsl but hangs prompting user name
#Write-Host "wsl whoami" 
# Attempt 0 conclusion: Starts installing the wsl but then waits on user input

# Attempt 0.1: So would like to pipe a "password | password | username | whoami" in there but that does not work.
#Write-Host "wsl 'somepassword | somepassword | someusername | whoami'"
#Write-Host "wsl somepassword | somepassword | someusername | whoami" 
# Attempt 0.1 conclusion: doesn't work, still dives into the wsl shell and waits on user input


# Attempt 1: does not make it start installing
#$output = bash -c "wsl whoami"
#$output = bash -c "wsl 'somepassword | somepassword | someusername | whoami'" 
# Attempt 1 conclusion: Does not work, requires a user input to start installing (e.g. arrow down) (and then waits on user input).


# Attempt 2: try to prevent the prompt for username by setting default user to root immediatly

# Attempt 2.1: First define path to the installed ubuntu1804.exe
$str1="/Users/"
$str2="/AppData/Local/Microsoft/WindowsApps/ubuntu1804"
$hdd_name=(Get-WmiObject Win32_OperatingSystem).SystemDrive
$username=$env:UserName
[String] $ubuntu1804_path=$hdd_name+$str1+$username+$str2

# Attempt 2.2: Create command to set root as default user
$str1=" config --default-user root"
$set_user=$ubuntu1804_path+$str1

# Attempt 2.3: Create command to set root as default user and execute it
#invoke-expression -Command $set_user 
# Attempt 2.3 conclusion: Doesn't work still asks for username and waits on user input


# Attempt 3: passing a username, password, and password again as one is prompted at the startup
$strA = "test | test | root"
#$output = bash "-c" $strA
# Attempt 3 conclusion: Doesn't work, requires user input to go to the next line (e.g. arrow down)

# Attempt 4: let root be default username
$str1=" install --root"
$set_user=$ubuntu1804_path+$str1
# Attempt 4 conclusion: Doesn't work, requires user input to go to the next line (e.g. arrow down)
invoke-expression -Command $set_user 
# Attempt 4 conclusion: Pending.

Write-Host "Done with setup."

在没有用户干预的情况下，尝试 0、1、2 和 3 均未成功自动初始化 WSL Ubuntu 18.04。尝试的问题写在评论的结论中。归根结底，wsl一旦激活就开始安装/初始化，然后在powershell窗口中等待用户输入，而无需在其中传递命令的其余部分。

问题：

如何从 powershell 执行 WSL Ubuntu 18.04 的无人值守安装和初始化？

假设

我事先知道 Powershell 中变量中的用户名和密码。