Roblox has no native Linux client. The current, actively-maintained way to run it is Sober (from the Vinegar project) - a Flatpak that runs the real Roblox client through a purpose-built Wine layer, rather than a generic Wine prefix.

pearOS NiceC0re (Arch-based)

Flatpak isn't installed by default - set it up first:

sudo pacman -S flatpak
flatpak remote-add --if-not-exists flathub https://dl.flathub.org/repo/flathub.flatpakrepo
flatpak install flathub org.vinegarhq.Sober

pearOS Goldwing (Debian-based)

Flatpak and the Flathub remote are already set up by default - just install it:

flatpak install flathub org.vinegarhq.Sober

On either build: launch Sober from the app menu, log into Roblox as usual. It needs a working Vulkan-capable GPU driver - if it fails to start, check your GPU driver article first (NVIDIA especially needs the proprietary driver, not nouveau).