Is it possible to run Linux utils from Mathematica using Windows Subsystem for Linux?

Question

I have Windows 10 Professional x64 with WSL2 installed. I've also installed Ubuntu 20.04 LTS from Microsoft Store.

I can type ubuntu2004 in the CMD and get access to Linux utils installed under Ubuntu. For example, I've installed the poppler-utils and now have pdfunite:

My disk C:\ is already mounted in the Ubuntu filesystem as /mnt/c and I have full access to it from my Ubuntu:

Suppose I have copied (under Windows) two PDF files into this directory, say 1.pdf and 2.pdf:

And I wish to combine them using pdfunite from Ubuntu, but I want to perform this programmatically from Mathematica, without using the terminal interface. Under the terminal, it would be sufficient just to type:

pdfunite 1.pdf 2.pdf combined.pdf

But how can I do this from Mathematica using perhaps such commands as RunProcess or ExternalEvaluate?

P.S. pdfunite is just an example. Actually I wish to understand how I can use any Ubuntu command-line utility from Mathematica installed on Windows.

Answer 1

Thanks to the answer linked by Jason B., after experimenting a bit I've found that it is as easy as follows:

SetDirectory["C:\\Mathematica_work"];
RunProcess[{"ubuntu2004", "run", "pdfunite", "1.pdf", "2.pdf", "combined.pdf"}]

<|"ExitCode" -> 0, "StandardOutput" -> "", "StandardError" -> ""|>

Now we got the desired combined.pdf:

FileNames[]

{"1.pdf", "2.pdf", "combined.pdf"}