/usr/share/lxc/config/ is in lxc-templates 3.0.0-0ubuntu1.
This file is owned by root:root, with mode 0o755.
..
/usr/share/lxc/config/alpine.common.conf
/usr/share/lxc/config/alpine.userns.conf
/usr/share/lxc/config/archlinux.common.conf
/usr/share/lxc/config/archlinux.userns.conf
/usr/share/lxc/config/centos.common.conf
/usr/share/lxc/config/centos.userns.conf
/usr/share/lxc/config/debian.common.conf
/usr/share/lxc/config/debian.userns.conf
/usr/share/lxc/config/fedora.common.conf
/usr/share/lxc/config/fedora.userns.conf
/usr/share/lxc/config/gentoo.common.conf
/usr/share/lxc/config/gentoo.moresecure.conf
/usr/share/lxc/config/gentoo.userns.conf
/usr/share/lxc/config/opensuse.common.conf
/usr/share/lxc/config/opensuse.userns.conf
/usr/share/lxc/config/openwrt.common.conf
/usr/share/lxc/config/oracle.common.conf
/usr/share/lxc/config/oracle.userns.conf
/usr/share/lxc/config/plamo.common.conf
/usr/share/lxc/config/plamo.userns.conf
/usr/share/lxc/config/sabayon.common.conf
/usr/share/lxc/config/sabayon.userns.conf
/usr/share/lxc/config/slackware.common.conf
/usr/share/lxc/config/slackware.userns.conf
/usr/share/lxc/config/sparclinux.common.conf
/usr/share/lxc/config/sparclinux.userns.conf
/usr/share/lxc/config/ubuntu-cloud.common.conf
/usr/share/lxc/config/ubuntu-cloud.lucid.conf
/usr/share/lxc/config/ubuntu-cloud.userns.conf
/usr/share/lxc/config/ubuntu.common.conf
/usr/share/lxc/config/ubuntu.lucid.conf
/usr/share/lxc/config/ubuntu.userns.conf
/usr/share/lxc/config/voidlinux.common.conf
/usr/share/lxc/config/voidlinux.userns.conf