What part of Cubase's system requirements mention Linux?
You might be able to get it working under WINE, but the elicenser stuff might be troublesome. You'll be relying completely on other users to help you get it running, and in the end it might not anyway.
You could try VirtualBox (and install the USB plugin to use your Steinberg Key) with a Windows install, but that sorta defeats the purpose.
You'd be better off switching to a Linux DAW if you went to Linux, to be perfectly honest.