This file is indexed.

/lib/udev/rules.d/69-wacom.rules is in xserver-xorg-input-wacom 1:0.36.1-0ubuntu1.

This file is owned by root:root, with mode 0o644.

The actual contents of the file can be viewed below.

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ACTION!="add|change", GOTO="wacom_end"

# Match all serial wacom tablets with a serial ID starting with WACf
# Notes: We assign NAME though we shouldn't, but currently the server requires it
#        We assign the lot to subsystem pnp too because server reads NAME from
#        the parent device. Once all that's fixed, as simple SUBSYSTEM="tty"
#        will do and the ENV{NAME} can be removed.
SUBSYSTEM=="tty|pnp", SUBSYSTEMS=="pnp", ATTRS{id}=="WACf*", ENV{ID_MODEL}="Serial Wacom Tablet $attr{id}", ENV{ID_INPUT}="1", ENV{ID_INPUT_TABLET}="1", ENV{NAME}="Serial Wacom Tablet $attr{id}"
SUBSYSTEM=="tty|pnp", SUBSYSTEMS=="pnp", ATTRS{id}=="FUJ*", ENV{ID_MODEL}="Serial Wacom Tablet $attr{id}", ENV{ID_INPUT}="1", ENV{ID_INPUT_TABLET}="1", ENV{NAME}="Serial Wacom Tablet $attr{id}"

# comment out the next line if your distribution does not provide systemd
# If a /dev/ttySx device with the WACf name is detected, start the
# wacom-inputattach service with the kernel name as parameter
SUBSYSTEM=="tty|pnp", KERNEL=="ttyS[0-9]*", ATTRS{id}=="WACf*", TAG+="systemd", ENV{SYSTEMD_WANTS}+="wacom-inputattach@%k.service"

LABEL="wacom_end"