It looks like Ubuntu Mate has difficulties with using Python’s RPi.GPIO.
I am finding a Raspberry PI 3 with the Ubiquity Raspi image will segfault if running a python script that relies on RPi.GPIO.
From a forum post the issues appears to be:
“…The reason for the segfault is that the Ubuntu kernel was built with CONFIG_STRICT_DEVMEM set true. It was unset in the raspbian kernel. (It is a setting under Kernel Hacking)…”