Install with LXD

Was this process tested? I went thru line-by-line, and got stuck installing MaaS via Snap due to udev issues.

root@bionic-maas:~# snap install maas --channel=2.7
2020-06-26T19:22:11Z INFO Waiting for restart...
error: cannot perform the following tasks:
- Setup snap "maas" (6633) security profiles (cannot setup udev for snap "maas": cannot reload udev rules: exit status 2
udev output:
)
- Setup snap "maas" (6633) security profiles (cannot reload udev rules: exit status 2
udev output:
)
- Setup snap "maas" (6633) security profiles for auto-connections (cannot reload udev rules: exit status 2
udev output:
)
root@bionic-maas:~# service udev reload
 * udev does not support containers, not started
root@bionic-maas:~# service udev start
root@bionic-maas:~# service udev reload
 * udev does not support containers, not started
root@bionic-maas:~# service udev status
● systemd-udevd.service - udev Kernel Device Manager
   Loaded: loaded (/lib/systemd/system/systemd-udevd.service; static; vendor preset: enabled)
   Active: inactive (dead)
Condition: start condition failed at Fri 2020-06-26 19:25:54 UTC; 3s ago
           └─ ConditionPathIsReadWrite=/sys was not met
     Docs: man:systemd-udevd.service(8)
           man:udev(7)