Yesterday I upgraded from version 17.0.5 to 18.0.4.
I got an error related to the Talk App.
2020-04-23T20:41:43+02:00 Repair error: Repair step ‘OCA\Talk\Migration\FixNamespaceInDatabaseTables’ is unknown
2020-04-23T20:41:43+02:00 Repair info: No repair steps available
PHP Fatal error: Cannot declare class OCA\Talk\Migration\Version8000Date20200331144101, because the name is already in use in /var/www/nextcloud/apps/spreed/lib/Migration/Version8000Date20200331144101.php on line 54
i had to do an occ upgrade again and enable Talk App after that.
Today I realized that my shared files and folders from a read only external storages does not work. It is configured in Settings -> Administration -> External storages as local and read only. It does not work with version 18.0.4. I have a test installation with 18.0.4 and it does not work either.
I guess this is the problem
I lot of errors in the log because of that. I decided to go back to version 17.0.5.