Problem

After importing the backup from a Cloud instance into a Server instance, the 'Mode' configuration is missing from the General Configuration page

Cause

There is a flag for a feature in Cloud instances called unified.usermanagement. 

Workaround

Workaround 1

Remove the feature flag from the database

1. Create backups of the instance and database
2. Shutdown the JIRA instance

3. Perform the following SQL query in the database

   delete from feature where feature_name like 'unified.usermanagement ';

4. Startup the JIRA instance

Workaround 2

Alternatively, navigate to the dark feature page:

<instance url>/SiteDarkFeatures!default.jspa

And remove the flag from there 

Resolution

This is being tracked in this bug ticket here - JRA-42426 - Getting issue details... STATUS