/lib/udev/rules.d/61-gnome-bluetooth-rfkill.rules is in gnome-bluetooth 3.18.2-1ubuntu2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 | # Set ACLs for console users on /dev/rfkill
# This is necessary until a daemon can properly handle access to the
# kill switch
# http://bugs.debian.org/563902
# https://bugzilla.redhat.com/show_bug.cgi?id=514798
# logind
# https://bugzilla.redhat.com/show_bug.cgi?id=733326
KERNEL=="rfkill", SUBSYSTEM=="misc", TAG+="uaccess"
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