I am also getting a similar segmentation fault on 17.04:
tblong@linux:~$ sudo gufw
No protocol specified
Unable to init server: Could not connect: Connection refused
No protocol specified
Unable to init server: Could not connect: Connection refused
...a bunch of Gdk errors
(gufw.py:14107): Gdk-CRITICAL **: gdk_keymap_get_for_display: assertion
'GDK_IS_DISPLAY (display)' failed
...the seg fault
/usr/bin/gufw-pkexec: line 13: 14107 Segmentation fault (core dumped)
python3 ${LOCATIONS[${i}]} $1
tblong@linux:~$ whereis python3
python3: /usr/bin/python3 /usr/bin/python3.5m /usr/bin/python3.5
/usr/lib/python3 /usr/lib/python3.6 /usr/lib/python3.5 /etc/python3
/etc/python3.5 /usr/local/lib/python3.5 /usr/include/python3.5m
/usr/share/python3 /usr/share/man/man1/python3.1.gz
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https://bugs.launchpad.net/bugs/1592380
Title:
GUFW can't start /usr/bin/gufw-pkexec: line 15: 8787 Segmentation
fault (core dumped) python ${LOCATIONS[${i}]} $1
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