Is it possible install Ubuntu in Windows 10 WSL without Microsoft Store?

Yes, it is possible to download the app without the Store. Some available distributions are listed in the Manual Installation section of the MS guide (https://docs.microsoft.com/en-us/windows/wsl/install-manual)

The actual manual installation instructions are hidden in the Server Install section of the manual (https://docs.microsoft.com/en-us/windows/wsl/install-on-server), but my understanding is that you can just run the .appx file you downloaded and it should work anyway.

Whether it's wise to install WSL/Ubuntu on a work computer that you don't control is another question, but one which only you can answer.

I had the same problem, could do it like this (from PowerShell):

# go into some folder into which you want the file to be downloadedcd <somefolder># download Ubuntu 20.04Invoke-WebRequest -Uri https://aka.ms/wslubuntu2004 -OutFile Ubuntu.appx -UseBasicParsing# install downloaded *.appx fileAdd-AppxPackage .\Ubuntu.appx

Afterwards I did Windows+S and typed "Ubuntu" to show the installed app, then executed it to finish setup (new user name + password must be given).

I checked the success doing: wsl --list --verbose and received this:

  NAME                   STATE           VERSION  Ubuntu-20.04           Running         1

So finally, I needed to convert my Ubuntu to WSL2 like this:

wsl --set-version Ubuntu-20.04 2

Voila!

Yes, It is possible to install Ubuntu without opening the store.

1. Open settings in windows and enable developer mode.

2. Once the developer mode is enabled, Go to Windows search and Type Bash.

3. It will open Bash command prompt. Allow it to download Ubuntu automatically.

Cheers!!!