does anybody know any exacutors for roblox linux (sober)

Sober runs in an Android container as far as I know which is basically Linux under the hood. I don't think anyone's actually went out of their way to make an exploit specifically to be compatible with Sober but I'm sure it'd have a similar loading process to whatever Android cheats exist right now.

The best way to get exploiting on Linux today is to set up a virtual machine using KVM, spoof the hypervisor bit, hide KVM by using arguments "-cpu 'host,kvm=off,-hypervisor'", and pass through a GPU with a physical display attached (either a monitor or through a dummy plug). You cannot run Roblox on a virtual display and you'll have to use a configuration like Sunshine and Moonlight or use Looking Glass to get a remote desktop screen on your host computer.

If you don't have two GPUs (i.e: laptops or desktops without iGPU + dGPU setups), you'll be stuck with either dual booting or using single-GPU passthrough. Single-GPU passthrough is a mess unless you really understand how to dynamically load/unload kernel modules and bind the GPU to VFIO.