Cant do changes to Services after moving to new server

[aalstad]

I have test converted our NagiosXi server from Centos 6 to ubuntu 20.04
It is working, and I can do changes to hosts, but if I do any changes to services, the Manage Hosts and the Manage Host Groups disappears.
And because of this I cant apply the changes.
The same happens if I create a new service, after I have saved the service, if the edit the server again the host is gone.
This is V 5.7.2 but I have also tried to upgrade it to V 5.9.2
Have run Config File Permissions Check from the GUI and it reports OK
I have under Config File Management, delete files / Write config

Has anybody seen this?

[gormank]

There's a step in the upgrade that you may need to run when changing the OS/version.

[gormank]

It could be in the backup and restore doc.