/lib/udev/rules.d/85-lvm2.rules is in lvm2 2.02.98-6ubuntu2.
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 | # This file causes block devices with LVM signatures to be automatically
# added to their volume group.
# See udev(8) for syntax
SUBSYSTEM=="block", ACTION=="add|change", ENV{ID_FS_TYPE}=="lvm*|LVM*", \
RUN+="watershed sh -c '/sbin/lvm vgscan; /sbin/lvm vgchange -a y'"
|