Segmentation fault, normally that would be hardware issues, but in this case can easily be RTAI kernel does not like something.
Can you download the old Wheezy ISO from here:
linuxcnc.org/iso/linuxcnc-2.7.14-wheezy.iso
Burn it to a USB, boot the PC from it, use the LinuxCNC config selector and run on of the included configs for parallel port, there are several so try more than one, report back it that works.
Thank you.
