Microsoft has announced that the upcoming Windows 10 2004 release will also include Windows Subsystem for Linux 2 (WSL 2) whose Linux kernel will be kept updated via Windows Update.
When Microsoft announced WSL2, they explained that all WSL2 distributions would use a real Microsoft-compiled Linux kernel based on the stable 4.19 version release of Linux at Kernel.org.
Starting with Windows 10 2004, which is expected to be released shortly, and in the latest Windows 10 Insider build 19041.153, when using WSL2 the Linux kernel will first need to be upgraded.
After upgrading, when you attempt to convert a WSL distribution to WSL2 or to launch an existing WSL2 distro, Windows 10 will prompt you to first update to the latest Linux kernel by displaying the following message.
"WSL 2 requires an update to its kernel component. For information please visit https://aka.ms/wsl2kernel"
For now, Windows 10 users will need to manually download and install the latest WSL 2 kernel using these instructions.
At this time, after installing the available Linux kernel update, WSL 2 distributions will be using the following kernel:
Linux version 4.19.84-microsoft-standard (oe-user@oe-host) (gcc version 8.2.0 (GCC)) #1 SMP Wed Nov 13 11:44:37 UTC 2019
In a future update to Windows 10 2004, though, Microsoft plans on distributing new WSL 2 kernels via Windows Update.
Similar to Windows Defender updates and Security Intelligence definition updates, if a new Linux kernel is available it will be downloaded when a user checks for new updates via Windows Update.
"If you’ve ever gone to your Windows settings, and clicked ‘Check for Updates’ you might have seen some other items being updated like Windows Defender malware definitions, or a new touchpad driver, etc. The Linux kernel in WSL2 will now be serviced in this same method, which means you’ll get the latest kernel version independently of consuming an update to your Windows image," Microsoft explained in a new blog post.
WSL2 being generally available soon is exciting news for users who use this feature as it brings numerous performance improvements to Windows
As WSL2 uses a true Linux kernel, Linux apps will now have full access to their normal system calls, which will bring increased compatibility with existing Linux apps and greater performance.
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