I had similar issues upgrading from .104.3 to .105.x. From end never loaded with no errors in log. Can you get to the docker logs in Hassos install on pi? If so, how do you find the container id? By the way a fresh install of .105.5 worked and all of my HacS and integrations installed with no issues. A new update broke it again. I see a lot of different forum messages about front end not loading either after an update or reboot. Would be nice if we could find the cause so this can get to the developers to fix.
9 of 10 times this is due to configuration issues. They are fixing it with the “Safe Mode” feature.
docker ps
shows all the currently running containers
I’ll try again with just default configuration.Yaml. so others when it failed with the default
This works, Thanks. So when the front end does load, what docker is not loading? Also can you restart a docker form cli?
Usually this caused by third party integration that not compliant and cause problem. Else it is someone that update but not do a breaking change. Both case it is more in end user than HA since either not native add-on or not read docs.
Yes
docker start <container name or Container ID>
EDIT
Yeah, maybe restart not start 
Yes, docker restart <container ID>
It means there’s a configuration issue OR your browser is Safari and you should use something else 
I use chrome. Doesn’t load I any of my devices (5).
What does your log say?
No errors in core. Errors in su. Unable to connect errors. I have them saved at home and can post later. In the discord chat people have said HA did not start. No clue as to why and how to fix. Is the container for Ha a generic name or is it unique for each system?
Depends on how you installed it.
So I should start with both a generic configuration yaml & a generic Lovelace, then update?
What is strange is when I setup a new install. I was able to install all the integrations I had. From the community store, HACS and integrations. None failed to load.
99% of the time it’s a breaking change that you didn’t notice that’s broken your setup 
I had it happen once or twice. Only way to know for sure tho is to check the logs 
I read and re-read the breaking changes and I had two integrations that were mentioned (simplisafe and Garmin) I uninstalled both before trying the update. Maybe it is caused by the custom cards I use in Lovelace? None are mentioned. I have no problem with breaking changes as we are working with a beta. The problem I have is no error in the core log. This gives me know idea on what needs fixing. Once I get more familiar with a VM I think I will move everything to it as it takes a lot less time going back and forth between versions.
Ya you’ll need to do the docker log -f <container ID/container name> command to actually see what’s going on.
Thanks. This is the first I heard about the docker log. The docs only mention the core and the su logs in Hassio
HA uses docker but docs will not deep explanation of docker functions and troubleshooting
No. Best you can do is read docs and apply breaking changes. You use Custom Cards and 3rd Party integrations which put you at risk if breakage with every update sine these are technically not supported.