This file is indexed.

/etc/default/lxc is in lxc-utils 3.0.0-0ubuntu2.

This file is owned by root:root, with mode 0o644.

The actual contents of the file can be viewed below.

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# LXC_AUTO - whether or not to start containers at boot
LXC_AUTO="true"

# BOOTGROUPS - What groups should start on bootup?
#	Comma separated list of groups.
#	Leading comma, trailing comma or embedded double
#	comma indicates when the NULL group should be run.
# Example (default): boot the onboot group first then the NULL group
BOOTGROUPS="onboot,"

# SHUTDOWNDELAY - Wait time for a container to shut down.
#	Container shutdown can result in lengthy system
#	shutdown times.  Even 5 seconds per container can be
#	too long.
SHUTDOWNDELAY=5

# OPTIONS can be used for anything else.
#	If you want to boot everything then
#	options can be "-a" or "-a -A".
OPTIONS=

# STOPOPTS are stop options.  The can be used for anything else to stop.
#	If you want to kill containers fast, use -k
STOPOPTS="-a -A -s"

USE_LXC_BRIDGE="false"  # overridden in lxc-net

[ ! -f /etc/default/lxc-net ] || . /etc/default/lxc-net