Internal Server Error on the ISPconfig home page

After replacing NGINX and installing Apache I can no longer open the ISPconfig homepage at ---. ---. --- .---: 8080.
I get the Internal Server Error.
I have verified that Apache is working properly.
Do you have any idea?

Thank you

 

Check your apache error log first. There you can find some clues.

 

Have you followed the Perfect Server Guide for Apache to configure your host and get all necessary software installed?
Have you forced reconfigure services now that nginx has been replaced by apache?
Try this:
https://www.howtoforge.com/community/threads/please-read-before-posting.58408/

 

I don't see any errors when the problem occurs. I think the problem depends on ISPconfig which cannot perfectly configure the server with Ubuntu 20.

 

Ubuntu 20? It is not officially supported yet, though beta may be released already, I think.