/usr/share/lxc/config/ubuntu-cloud.common.conf is in lxc-templates 2.0.0-0ubuntu2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 | # This derives from the main Ubuntu config
lxc.include = /usr/share/lxc/config/ubuntu.common.conf
lxc.hook.clone = /usr/share/lxc/hooks/ubuntu-cloud-prep
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