/usr/share/lxc/config/ubuntu.userns.conf is in lxc-templates 3.0.0-0ubuntu1.
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 derives from the global userns config
lxc.include = /usr/share/lxc/config/userns.conf
# Extra fstab entries as mountall can't mount those by itself
lxc.mount.entry = /sys/firmware/efi/efivars sys/firmware/efi/efivars none bind,optional 0 0
lxc.mount.entry = /proc/sys/fs/binfmt_misc proc/sys/fs/binfmt_misc none bind,optional 0 0
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