Error: Failed container creation: Failed to load raw.lxc

I follow below URL to try to install and test MaaS,

https://docs.maas.io/2.1/en/installconfig-lxd-install

At the profile edit part, from above documents

lxc profile edit maas

replace the {} after config with the following (excluding config:):

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config:
  raw.lxc: |-
    lxc.cgroup.devices.allow = c 10:237 rwm
    lxc.aa_profile = unconfined
    lxc.cgroup.devices.allow = b 7:* rwm
  security.privileged: "true"

At the launch step, I hit below issue,

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$ lxc launch -p maas ubuntu:16.04 xenial-maas
Creating xenial-maas
Error: Failed container creation: Failed to load raw.lxc

This is because I’m using LXD 3.0, and the configuration key above is old. Depending on this comment, lxc.aa_profile is changed to lxc.apparmor.profile from lxd 2.1.

So the workaround is

lxc profile edit maas again

replace the lxc.aa_profile with lxc.apparmor.profile

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config:
  raw.lxc: |-
    lxc.cgroup.devices.allow = c 10:237 rwm
    lxc.apparmor.profile = unconfined
    lxc.cgroup.devices.allow = b 7:* rwm
  security.privileged: "true"

re-run the launch command

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$ lxc launch -p maas ubuntu:16.04 xenial-maas
Creating xenial-maas
Starting xenial-maas