You'll be struggling to get something that runs on linux.
Lathe CAM doesn't have that many options, let alone ones that will run on linux.

I think CamBam has a linux option, although it's lathe capabilites are pretty limited (lathe only got added within the last couple releases).
The usual options are Lazyturn (it's free - there's a forum on the Machsupport forum) which is fairly limited and not being actively developed (it was written by Art but there wasn't really the demand for it), or Dolphin CADCAM, which is a lot more comprehensive but costs more.
I'm not sure how Bobcam compares.