I have found that a backup made with this installation does not work on a regular installation (same version: 5.0.2). In my browser localhost produces the Ubuntu default Apache 2 page, and localhost/openemr produces a blank page. I should say that this is on a previously working installation of Openemr.
Log:
[Mon May 25 12:11:49.596681 2020] [php7:error] [pid 1026] [client 127.0.0.1:46446] PHP Fatal error: require_once(): Failed opening required 'sites/default/sqlconf.php' (include_path='.:/usr/share/php') in /var/www/openemr/index.php on line 21