Windows Subsystem for Linux Installation Guide for Windows 10

There are two options available for installing Windows Subsystem for Linux (WSL):

Simplified install (preview release): wsl —install

The wsl —install simplified install command requires that you join the Windows Insiders Program and install a preview build of Windows 10 (OS build 20262 or higher), but eliminates the need to follow the manual install steps. All you need to do is open a command window with administrator privileges and run wsl —install , after a restart you will be ready to use WSL.

Manual install: Follow the six steps listed below.

The manual install steps for WSL are listed below and can be used to install Linux on any version of Windows 10.

If you run into an issue during the install process, check the Troubleshooting installation section at the bottom of this page.

Simplified Installation for Windows Insiders

The installation process for Windows Subsystem for Linux has been significantly improved in the latest Windows Insiders preview builds of Windows 10, replacing the manual steps below with a single command.

In order to use the wsl —install simplified install command, you must:

• Join the Windows Insiders Program
• Install a preview build of Windows 10 (OS build 20262 or higher).
• Open a command line windows with Administrator privileges

Once those requirements are met, to install WSL:

• Enter this command in the command line you’ve opened in Admin mode: wsl.exe —install
• Restart your machine

The first time you launch a newly installed Linux distribution, a console window will open and you’ll be asked to wait for files to de-compress and be stored on your PC. All future launches should take less than a second.

CONGRATULATIONS! You’ve successfully installed and set up a Linux distribution that is completely integrated with your Windows operating system!

The —install command performs the following actions:

• Enables the optional WSL and Virtual Machine Platform components
• Downloads and installs the latest Linux kernel
• Sets WSL 2 as the default
• Downloads and installs a Linux distribution (reboot may be required)

By default, the installed Linux distribution will be Ubuntu. This can be changed using wsl —install -d . (Replacing with the name of your desired distribution.) Additional Linux distributions may be added to your machine after the initial install using the wsl —install -d command.

To see a list of available Linux distributions, enter wsl —list —online .

Manual Installation Steps

If you are not on a Windows Insiders build, the features required for WSL will need to be enabled manually following the steps below.

Step 1 — Enable the Windows Subsystem for Linux

You must first enable the «Windows Subsystem for Linux» optional feature before installing any Linux distributions on Windows.

Open PowerShell as Administrator and run:

We recommend now moving on to step #2, updating to WSL 2, but if you wish to only install WSL 1, you can now restart your machine and move on to Step 6 — Install your Linux distribution of choice. To update to WSL 2, wait to restart your machine and move on to the next step.

Step 2 — Check requirements for running WSL 2

To update to WSL 2, you must be running Windows 10.

• For x64 systems: Version 1903 or higher, with Build 18362 or higher.
• For ARM64 systems: Version 2004 or higher, with Build 19041 or higher.
• Builds lower than 18362 do not support WSL 2. Use the Windows Update Assistant to update your version of Windows.

To check your version and build number, select Windows logo key + R, type winver, select OK. Update to the latest Windows version in the Settings menu.

If you are running Windows 10 version 1903 or 1909, open «Settings» from your Windows menu, navigate to «Update & Security» and select «Check for Updates». Your Build number must be 18362.1049+ or 18363.1049+, with the minor build # over .1049. Read more: WSL 2 Support is coming to Windows 10 Versions 1903 and 1909. See the troubleshooting instructions.

Step 3 — Enable Virtual Machine feature

Before installing WSL 2, you must enable the Virtual Machine Platform optional feature. Your machine will require virtualization capabilities to use this feature.

Open PowerShell as Administrator and run:

Restart your machine to complete the WSL install and update to WSL 2.

Step 4 — Download the Linux kernel update package

Download the latest package:

If you’re using an ARM64 machine, please download the ARM64 package instead. If you’re not sure what kind of machine you have, open Command Prompt or PowerShell and enter: systeminfo | find «System Type» . Caveat: On non-English Windows versions, you might have to modify the search text, for example, in German it would be systeminfo | find «Systemtyp» .

Run the update package downloaded in the previous step. (Double-click to run — you will be prompted for elevated permissions, select ‘yes’ to approve this installation.)

Once the installation is complete, move on to the next step — setting WSL 2 as your default version when installing new Linux distributions. (Skip this step if you want your new Linux installs to be set to WSL 1).

Step 5 — Set WSL 2 as your default version

Open PowerShell and run this command to set WSL 2 as the default version when installing a new Linux distribution:

Step 6 — Install your Linux distribution of choice

Open the Microsoft Store and select your favorite Linux distribution.

The following links will open the Microsoft store page for each distribution:

From the distribution’s page, select «Get».

The first time you launch a newly installed Linux distribution, a console window will open and you’ll be asked to wait for a minute or two for files to de-compress and be stored on your PC. All future launches should take less than a second.

CONGRATULATIONS! You’ve successfully installed and set up a Linux distribution that is completely integrated with your Windows operating system!

Install Windows Terminal (optional)

Windows Terminal enables multiple tabs (quickly switch between multiple Linux command lines, Windows Command Prompt, PowerShell, Azure CLI, etc), create custom key bindings (shortcut keys for opening or closing tabs, copy+paste, etc.), use the search feature, and custom themes (color schemes, font styles and sizes, background image/blur/transparency). Learn more.

Set your distribution version to WSL 1 or WSL 2

You can check the WSL version assigned to each of the Linux distributions you have installed by opening the PowerShell command line and entering the command (only available in Windows Build 18362 or higher): wsl -l -v

To set a distribution to be backed by either version of WSL please run:

Make sure to replace with the actual name of your distribution and with the number ‘1’ or ‘2’. You can change back to WSL 1 at anytime by running the same command as above but replacing the ‘2’ with a ‘1’.

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.

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.

Additionally, if you want to make WSL 2 your default architecture you can do so with this command:

This will set the version of any new distribution installed to WSL 2.

Troubleshooting installation

Below are related errors and suggested fixes. Refer to the WSL troubleshooting page for other common errors and their solutions.

Installation failed with error 0x80070003

• The Windows Subsystem for Linux only runs on your system drive (usually this is your C: drive). Make sure that distributions are stored on your system drive:
• Open Settings -> **System —>Storage ->More Storage Settings: Change where new content is saved

WslRegisterDistribution failed with error 0x8007019e

• The Windows Subsystem for Linux optional component is not enabled:
• Open Control Panel ->Programs and Features ->Turn Windows Feature on or off -> Check Windows Subsystem for Linux or using the PowerShell cmdlet mentioned at the beginning of this article.

Installation failed with error 0x80070003 or error 0x80370102

• Please make sure that virtualization is enabled inside of your computer’s BIOS. The instructions on how to do this will vary from computer to computer, and will most likely be under CPU related options.
• WSL2 requires that your CPU supports the Second Level Address Translation (SLAT) feature, which was introduced in Intel Nehalem processors (Intel Core 1st Generation) and AMD Opteron. Older CPUs (such as the Intel Core 2 Duo) will not be able to run WSL2, even if the Virtual Machine Platform is successfully installed.

Error when trying to upgrade: Invalid command line option: wsl —set-version Ubuntu 2

• Enure that you have the Windows Subsystem for Linux enabled, and that you’re using Windows Build version 18362 or higher. To enable WSL run this command in a PowerShell prompt with admin privileges: Enable-WindowsOptionalFeature -Online -FeatureName Microsoft-Windows-Subsystem-Linux .

The requested operation could not be completed due to a virtual disk system limitation. Virtual hard disk files must be uncompressed and unencrypted and must not be sparse.

• Deselect “Compress contents” (as well as “Encrypt contents” if that’s checked) by opening the profile folder for your Linux distribution. It should be located in a folder on your Windows file system, something like: USERPROFILE%\AppData\Local\Packages\CanonicalGroupLimited.
• In this Linux distro profile, there should be a LocalState folder. Right-click this folder to display a menu of options. Select Properties > Advanced and then ensure that the “Compress contents to save disk space” and “Encrypt contents to secure data” checkboxes are unselected (not checked). If you are asked whether to apply this to just to the current folder or to all subfolders and files, select “just this folder” because you are only clearing the compress flag. After this, the wsl —set-version command should work.

In my case, the LocalState folder for my Ubuntu 18.04 distribution was located at C:\Users \AppData\Local\Packages\CanonicalGroupLimited.Ubuntu18.04onWindows_79rhkp1fndgsc

Check WSL Docs GitHub thread #4103 where this issue is being tracked for updated information.

The term ‘wsl’ is not recognized as the name of a cmdlet, function, script file, or operable program.

• Ensure that the Windows Subsystem for Linux Optional Component is installed. Additionally, if you are using an ARM64 device and running this command from PowerShell, you will receive this error. Instead run wsl.exe from PowerShell Core, or Command Prompt.

Error: This update only applies to machines with the Windows Subsystem for Linux.

• To install the Linux kernel update MSI package, WSL is required and should be enabled first. If it fails, it you will see the message: This update only applies to machines with the Windows Subsystem for Linux .
• There are three possible reason you see this message:

You are still in old version of Windows which doesn’t support WSL 2. See step #2 for version requirements and links to update.

WSL is not enabled. You will need to return to step #1 and ensure that the optional WSL feature is enabled on your machine.

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’, and install it again.

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Memory Reclaim in the Windows Subsystem for Linux 2



October 30th, 2019

We’ve added a new Windows Subsystem for Linux (WSL) feature in Windows Insider Preview Build 19013: Memory Reclamation for WSL 2! Previously, when the memory needs of the WSL2 Virtual Machine (VM) would grow, either from your workflow or by the Linux kernel, the overall memory allocated to the VM would also grow by allocating more memory from the host. But, once the workflow is done, that memory which is no longer needed by the workflow would not get released back to the host. Now with memory reclamation in WSL 2, when the memory in Linux is no longer needed it can be reported back to the host where it will be freed and your WSL 2 VM will shrink in memory size.

You can learn all about this new feature by checking out the quick video below or reading on in this blog post.

Hands on with memory reclamation

When a Linux process releases in-use memory, that memory will then be returned to the Windows host. Let’s break this down with an example.

We’ll run a simple C application which will use a large amount of memory. Here’s the source code:

Before we run the app, we are using a small amount of memory in both Windows and Linux. We’re measuring the memory used in Windows by watching the memory use of the ‘Vmmem’ process which is responsible for the virtual machine that powers WSL2. In Linux, we used the free -h command to output the amount of used and cached memory.



Once we run the app, memory use in our Linux distro grows and so does our WSL 2 VM’s memory in Windows.



Then we free the in-use memory, and the ‘vmmem’ process which powers your WSL 2 VM shrinks back down in size, meaning that freed memory is now back on your Windows host, and ready to be used in other applications!



The other half of the story: cached memory

User processes are not the only things that use memory in the Linux VM. The Linux kernel also uses many caches including a page cache, which caches file contents to improve file system performance. Let’s look at a more real-world example to see how this comes into play.

We’ll run a sample container app that starts up some databases and a NodeJS server using docker-compose . You can find the source code here: craigloewen-msft/docker-node-mongo (thank you Github user: bradtraversy for creating the original project!)

After we build the images and run the containers, our memory usage is sitting at 2 GB in Windows, even though our in-use memory in Linux is just at 50MB.



This is because we accessed a lot of different files, and now our page cache is at 1.7GB in size. We do not free the page cache until the Linux kernel frees it. This is a design decision to ensure you experience the performance improvements of the page cache. If you wish to drop the contents manually you can run echo 1 > /proc/sys/vm/drop_caches as the root user to do so. Once that memory is freed, then it will also be returned to Windows and your WSL2 VM will shrink in size. In this example, when I close my terminal Windows running the WSL distro the page cache is freed naturally by the Linux kernel.

How it works

This feature is powered by a Linux kernel patch that allows small contiguous blocks of memory to be returned to the host machine when they are no longer needed in the Linux guest. We updated the Linux kernel in WSL2 to include this patch, and modified Hyper-V to support this page reporting feature. In order to return as much memory to the host as possible, we periodically compact memory to ensure free memory is available in contiguous blocks. This only runs when your CPU is idle. You can see when this happens by looking for the ‘WSL2: Performing memory compaction’ message inside of the output of the dmesg command. If you’re a power user you can configure this behavior by editing values in .wslconfig. Please check the WSL 19013 release notes to see these options. Alternatively if you’d like to run this Linux command manually you can run the command echo 1 > /proc/sys/vm/compact_memory as the root user.

Feedback

If you have any questions, or want to stay up to date with news you can find a list of WSL team members that are active on Twitter here. If you run into any technical problems please file an issue on our Github repo: Microsoft/WSL. We’ll be looking forwards to hearing what you think of the new feature!

Sample commits in the WSL 2 Linux Kernel to enable page reporting: #1 and #2.

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