Add ARM64 bug to install note

Based on #1039
Thanks @walbourn!

Author: mattwojo

WSL/install-win10.md

@@ -2,7 +2,7 @@
 title: Install Windows Subsystem for Linux (WSL) on Windows 10
 description: Installation guide for WSL on your Windows 10, with a Bash terminal, including Ubuntu, Debian, SUSE, Kali, Fedora, Pengwin, and Alpine. 
 keywords: BashOnWindows, bash, wsl, windows, windows subsystem for linux, windowssubsystem, ubuntu, debian, suse, windows 10, install, enable, WSL2, version 2
-ms.date: 09/15/2020
+ms.date: 04/07/2021
 ms.topic: article
 ms.localizationpriority: high
 ---
@@ -178,7 +178,7 @@ Make sure to replace `<distribution name>` with the actual name of your distribu
 > [!NOTE]
 > The update from WSL 1 to WSL 2 may take several minutes to complete depending on the size of your targeted distribution. If you are running an older (legacy) installation of WSL 1 from Windows 10 Anniversary Update or Creators Update, you may encounter an update error. Follow these instructions to [uninstall and remove any legacy distributions](./install-legacy.md#uninstallingremoving-the-legacy-distro).
 >
-> If `wsl --set-default-version` results as an invalid command, enter `wsl --help`. If the `--set-default-version` is not listed, it means that your OS doesn't support it and you need to update to version 1903, Build 18362 or higher.
+> If `wsl --set-default-version` results as an invalid command, enter `wsl --help`. If the `--set-default-version` is not listed, it means that your OS doesn't support it and you need to update to version 1903, Build 18362 or higher. If you are on Build 19041 for ARM64, this command may fail when using PowerShell in which case you can use a *Command Prompt* instead to issue the ``wsl.exe`` command.
 >
 > If you see this message after running the command: `WSL 2 requires an update to its kernel component. For information please visit https://aka.ms/wsl2kernel`. You still need to install the MSI Linux kernel update package.
 
@@ -234,4 +234,4 @@ Below are related errors and suggested fixes. Refer to the [WSL troubleshooting
   3. After you enabled WSL, a reboot is required for it to take effect, reboot your machine and try again.
 
 - **Error: WSL 2 requires an update to its kernel component. For information please visit https://aka.ms/wsl2kernel .**
-  - If the Linux kernel package is missing in the %SystemRoot%\system32\lxss\tools folder, you will encounter this error. Resolve it by installing the Linux kernel update MSI package in step #4 of these installation instructions. You may need to uninstall the MSI from ['Add or Remove Programs'](ms-settings:appsfeatures-app), and install it again.
+  - If the Linux kernel package is missing in the %SystemRoot%\system32\lxss\tools folder, you will encounter this error. Resolve it by installing the Linux kernel update MSI package in step #4 of these installation instructions. You may need to uninstall the MSI from ['Add or Remove Programs'](ms-settings:appsfeatures-app), and install it again.