I am having the same problem. I can not access the frontpage anymore but ssh works. I even restarted the system but that does not work either. I am starting to guess it maybe has something to do with the duckdns addon perhaps?
Try this and then see if it starts:
mv /config/.storage/core.config_entries /config/.storage/core.config_entries.backup
The final step of hassio ha restart is waiting for the web ui to work. The supervisor times out and gives up waiting after 10 minutes which is when you get the error above.
You’re right, the timeout is around 10 minutes
the .storage/core.config_entries doesn’t seem to exist for me
core-ssh:/config# mv /config/.storage/core.config_entries /config/.storage/core.config_entries.backup
mv: can’t rename ‘/config/.storage/core.config_entries’: No such file or directory
core-ssh:/config#
core-ssh:/config# find / -name core.config_entries
core-ssh:/config#
Before reading your reply, I did a search for the panic error message, to read few posts talking about a syntax error in the configuration.yaml, so I moved it to configuration.yaml.old, creating a blank configuration.yaml file but this didn’t help either!
Would you know how can I stop an addon from the CLI?
I tried the below command to stop Duck DNS but got an error:
core-ssh:/config# hassio ad logo -name Duck DNS
Error decoding json invalid character ‘A’ looking for beginning of value: Addon does not exist
core-ssh:/config#
core-ssh:/config#
Will leave it for tonight and have another fresh look on it tomorrow.
I have exactly the same issue SSH OK no web ui and panic when trying to restart
Everything works no web ui
Drat, I had a similar problem I was able to fix by removing the chromecast entries in core.config_entries.
It’s unlikely an add-on issue but I think this should work for removing it: hassio ad uninstall -name core_duckdns
Have you tried fixing your configuration file?
I did clean up all entries in configuration.yaml
though maybe i should start with a default one
will let you know how i’ll go in few hours.
had the same issue … only worked once i deleted the core.config_entries file
@flamingm0e
You won’t believe it, I went and corrected line 55 (it was my “api_password:” with the first character being a “@”)
Upon restarting on ha, it did work!
Still can’t get over the fact, that this simple thing will stop ha from starting, I wonder in case the expert can do something to address it.
Many thank all
Grateful for all the hints
I would…
Did you have the chrome-cast integration configured? After having the problem re-appear many times, and several re-installs before I figured out blowing away core.config_entries fixed it… I’ve had it not re-appear by not reconfiguring the integration.
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Updated to 0.74.2 isuue is fixed for me 
Never thought the “compiling” code is so sensitive, but now I know…
My configuration is so simple, got a Xiaomi gateway with couple of sensors, kodi, a sonos play1 and few Xiaomi philips light -which i yet to figure out a way to add them directly to HA, didn’t experience with automation yet… still finding my way around…
My next step is to play with @resoai Dashboard a bit https://community.home-assistant.io/t/tileboard-new-dashboard-for-homeassistant/57173
Same issue here… get rid of the core.config_entries file (which I’d never have thought to do myself - so thanks for posting that!) and things start working again as far the web interface goes.
If I try to re-enable the Google Cast integration, things will work until a restart of HA and then I’m back to being unable to load the web ui.
Restart HA without cast integration enabled, all good.
Restart HA with cast integration enabled, no web ui every time.
Working fine until today… Guess I’m leaving Google Cast integration off for the time being…
I have a couple of chromecasts powered by the tv they are hooked up to so they turn off when the TV does. I have a suspicion them going offline may be contributing to the problem but haven’t had time to experiment.
I never considered that the chromecast/s could be adding to the issue - just the Google Home…
The only thing I use casting for in HA is announcements - so at the moment laziness is winning out over wanting to get it fixed
@mikegrb - Disconnected my chromecast - adding the cast integration back in worked and HA survives a restart now…
Although HA 0.76.1 & 0.76.2 released since my issue started, and me needing to reset my router and re-setup - so it could be that one of those also had something to do with it working again…
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I did the same yesterday so I could get TTS Google Home announcements. So far so good.
Thanks for the “get rid of core.config_entries” it also solved my GUI problem.