Cygwin runs modified linux binaries, whereas WSL simply provides a layer in between a full Ubuntu user space and the Windows Kernel, so that WSL can run any unmodified linux binary. Simply install it from apt-get and you're good to go. Cygwin also provides only a specific set of packages, whereas with WSL you can install anything available from a PPA.
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what is the advantage of this feature over cygwin/babun?
Cygwin runs modified linux binaries, whereas WSL simply provides a layer in between a full Ubuntu user space and the Windows Kernel, so that WSL can run any unmodified linux binary. Simply install it from apt-get and you're good to go. Cygwin also provides only a specific set of packages, whereas with WSL you can install anything available from a PPA.