Same here.
I’m seeing this:
The unhealthy part is this (Supervisor is not privileged):
Which leads me to this page instructing me to re-run the installation script. Hmm, hold that thought.
Elsewhere in the log there’s this error message informing me that the installed version of Network Manager (1.10.6) is not supported:
20-12-05 21:22:56 ERROR (MainThread) [supervisor.dbus.network] Version ‘1.10.6’ of NetworkManager is not supported!
A warning message contains a helpful link explaining the issue:
20-12-05 21:23:04 WARNING (MainThread) [supervisor.resolution.evaluations.base] NetworkManager is not correctly configured (more-info: Network Manager - Home Assistant)
It informs me of the following:
The current minimum supported version of NetworkManager is: 1.14.6.
However, Ubuntu informs me that my instance of Network Manager (1.10.6-2ubuntu1.4) is the latest version:
~$ sudo apt upgrade network-manager
Reading package lists... Done
Building dependency tree
Reading state information... Done
network-manager is already the newest version (1.10.6-2ubuntu1.4).
Calculating upgrade... Done
0 upgraded, 0 newly installed, 0 to remove and 0 not upgraded.
Not sure re-running the installation script will do much good if the latest version of Ubuntu’s Network Manager happens to be lower than what Home Assistant requires. 
EDIT
Overlooked to mention that the system was dead when we arrived home today (dark house; no lights). No browser access. Logged into the server and restarted it. Home Assistant took longer than normal to get back on its feet. First FUBAR in 2 years. Not kidding when it said it was ‘unhealthy’. 