/usr/share/lxc/config/oci.common.conf is in liblxc-common 3.0.1-0ubuntu1~18.04.2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 | # Uncomment the following if you want to use DHCP for OCI containers
#lxc.hook.start-host = /usr/share/lxc/hooks/dhclient
#lxc.hook.stop = /usr/share/lxc/hooks/dhclient
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