A "brief" rundown on how to install dcs on linux using steam's proton. Assumes that steam is installed and working, as well as your drivers.
I am using EndeavourOS(arch based). It's bleeding edge, but it makes getting vr and dcs working nice and simple. But bleeding edge is not for the faint of heart. It can be done with 'buntu, and I've posted a how to for that on reddit. Although there are extra dependancies that aren't needed in that how to.
Link in the comments for the DCS download link
VR launch options
force_enable_VR force_OpenXR