A Flatpak, and one ENet for both programs

Linux players can install the game as a Flatpak. It bundles the runtime libraries and ships the server next to the client, so Singleplayer and hosting work inside the sandbox.

flatpak install shootanddestroy-<version>-linux-x86_64.flatpak

Under the hood the client and server now build the same ENet fork, and your movement travels on an unreliable channel, so a lost packet no longer holds the next one back.