I bought an Ubuntu XPS 13 and Dell mailed me a Windows XPS 13. I spent some hours on the phone with support to asses if I should keep the device or return it. The support techs (many of them) seemed to agree I would be running into multiple significant troubles if I installed Ubuntu on their Windows XPS 13. I returned it.

Now I'm on a System76 Galago Pro. It isn't perfect but gosh it has served me well these years.