Well, looking at...
Windows Ubuntu Operating System
www.windowsfx.org
...I'd say they are a bit light on information. But, judging by "Windowsfx natively brings the Edge browser, Teams, Skype, PowerShell, Office Online, Code and more" on the page, I'd say they probably have Wine (
https://www.winehq.org/) pre-installed.
My best guess is that there's no upside to using that distro, apart from if you prefer the Windows UI, than it is to using some established Linux distribution with a well-configured Wine installation. Best option for most people is probably to install Ubuntu and then follow one of the well-made guides posted in the forum to get some parts of B4X up and running. And even that won't give you the full B4X experience, if I remember correctly.
For what it's worth: I'm a fairly hardcore fulltime Linux user. Even so, I have invested in a Windows computer that
only runs B4X (and some small related devtools), that I connect to from my Linux workstation using RDP. My Linux machine is rock solid. I have neither the time nor the patience to jump through hoops to get B4X working in an environment it wasn't designed for.