https://www.bleepingcomputer.com/news/microsoft/wsl2-now-rolling-out-to-devices-running-windows-10-1903-and-1909/

If you are still running Windows 10 version 1903 or 1909, then you have a nice little present coming as Microsoft just backported Windows Subsystem for Linux 2 to these older versions.

With the release of Windows 10 version 2004, Microsoft introduced the Windows Subsystem for Linux 2 (WSL2), which included a real Linux kernel, improved performance, and better application compatibility.