0.106: Light brightness stepping, better Safe Mode and person dialog

I just updated from 0.105.5 to 0.105.6 (HA Supervised on Ubuntu 18.04 host on a NUC). I checked all the breaking changes, I updated everything in HACS, I checked my config with the Config checker add-on. All good. So I hit the update button. I now have no front end - no safe mode, no nothing, just a screen that says This site can't be reached, 192.168.0.151 refused to connect. I can SSH in and I have access to my files through WinSCP, but I have no idea what to fix. I did a config check and it completed successfully. My logs are empty. I tried downgrading to 0.105.5, and that completed successfully, but didn’t get me a front end. I tried upgrading back. No change. Here’s what I have:

➜  ~ ha core info
arch: amd64
audio_input: null
audio_output: null
boot: true
custom: false
image: homeassistant/intel-nuc-homeassistant
ip_address: 172.30.32.1
last_version: 0.106.5
machine: intel-nuc
port: 8123
ssl: false
version: 0.106.5
wait_boot: 600
watchdog: true

I tried to see if I could restore a snapshot somehow, but I can’t use hass-cli, I get the following error:

➜  ~ hass-cli info
error: HTTPError: 502 Server Error: Bad Gateway for url: http://hassio/homeassistant/api/discovery_info
Run with -x to see full exception information

I even tried rebuilding the core, but it just gives an error:

Processing... Done.

Error: Unknown Error, see logs

ha core logs shows me a blank file.

I’ve never had an issue upgrading in the two years I’ve been using HA. I would really appreciate some ideas for how to get myself back to normal!