/lib/udev/rules.d/61-persistent-storage-android.rules is in udev 237-3ubuntu10.
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 | # Android based kernel exports the uevent property PARTNAME, which can be
# used to find out at run time the named partitions (e.g. boot) for the
# device. This is specially useful for the Touch based images and flash-kernel,
# to automatically update the kernel by writing at the correct partition
# (independently of the hardware revision).
ACTION!="remove", KERNEL=="mmcblk[0-9]p[0-9]", ENV{PARTNAME}=="?*", SYMLINK+="disk/by-partlabel/$env{PARTNAME}"
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