This must be one of the first time that this happens, something about Windows in this blogg. But i felt like this must be shared.
I was doing in place upgrade from Windows 2016 to 2019. And some some servers went well and some got this message.
The upgrade went to about 52% and the failed.
The server rebooted and went back to 2016. I thought that all these server were alike but something was different.
How did I found how to fix this
I was reading this logfile:
You can access this by viewing hidden files i C:\
The log file was big, 158MB
But i scrolled to the end and found some errors regarding RDPWEB.
So I looked closer at the servers. And all servers that had failed had for some reason RDP server installed. Why I did not know.
This can be by design if there really was RDP servers, but these servers where not. So thats why I could uninstall RDP.
I uninstalled RDP services and rebooted
Did the upgrade and it went fine!
Thanks for reading.