/var/lib/lxc/android/pre-start.d/15-no-uchroot is in lxc-android-config 0.162.
This file is owned by root:root, with mode 0o755.
The actual contents of the file can be viewed below.
1 2 3 4 | #!/bin/sh
# Make sure the ubuntu_chroot init service does not get started
sed -i '/ubuntu_chroot init$/,+2d' $LXC_ROOTFS_PATH/init.rc
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