If you want to use the Raspberry Pi to control your X-Carve and use Easel Local then you really need to read this post by @SamyKamkar Easel Local for Linux? - #17 by SamyKamkar
it is by far the easiest and best way to use the Raspberry Pi with the X-Carve and I have never needed any additional software to make it work. It also has the ability to update the firmware now and it is by far the most easy way to get the Easel Local to load and work. If you follow the directions it will load into memory on boot just like the windows and mac driver and it will not take over the port unless you connect to it, this means that it doesn’t interfere with UGS or any other controller you want to use.