We developed a small website with WordPress, Elementor Pro, and Crocoblock for a client in our data center.
The plan was to Backup this website with Akeeba and restore it 1:1 on the customer server using Kickstart.
The restoration went smoothly without any errors. We were able to access the admin environment without any issues.
However, when we tried to create a page, and wile typing the title, we get "Updating failed: The response is not a valid JSON response."
We tried saving the permalinks again and save them again, but without success.
Then, we reinstalled WordPress and all modules step by step on the client's server.
Creating a page worked without any problems.
Both servers are running Ubuntu 8.1.2-1ubuntu2.20.
What could be the issue?