It is a good question. As far as we know, the Roblox developers don’t plan to make a Linux version of the Roblox client, since the Linux Marketshare is small. There is a Developer Forum thread on this: https://devforum.roblox.com/t/proper-support-for-the-linux-platform/56544

However, there are a few workarounds, to get Roblox working on Linux, like Grapejuice and (the newest version of) Wine. Grapejuice: https://devforum.roblox.com/t/grapejuice-easily-run-roblox-on-linux/262949