/lib/udev/rules.d/71-u-d-c-gpu-detection.rules is in ubuntu-drivers-common 1:0.4.17.
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 | # Rule installed by ubuntu-drivers-common
# Create a file with the card details for gpu-manager
ACTION=="add", SUBSYSTEM=="drm", DEVPATH=="*/drm/card*", RUN+="/sbin/u-d-c-print-pci-ids"
# Create a file when a module is loaded
ACTION=="add", SUBSYSTEMS=="pci", DRIVERS=="nvidia*", RUN+="/bin/touch /run/u-d-c-nvidia-was-loaded"
ACTION=="add", SUBSYSTEM=="module", KERNEL=="fglrx*", RUN+="/bin/touch /run/u-d-c-fglrx-was-loaded"
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