/usr/share/lxc/config/plamo.common.conf is in lxc-templates 2.0.7-0ubuntu1~16.04.2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 | # This derives from the global common config
lxc.include = /usr/share/lxc/config/common.conf
# Doesn't support consoles in /dev/lxc/
lxc.devttydir =
# Extra cgroup device access
## rtc
lxc.cgroup.devices.allow = c 254:0 rm
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