Thanks for replying!
I've already tried that.
But know some files are missing that normally would be autogenerated😑
After I reinstall adminer and MariaDB, in the WebUI of adminer it says "SQLSTATE[HY000] [2006] MySQL server has gone away"
I already tried to create a User and Database on the console with:
mysql> CREATE DATABASE `mydb`;
But even at this point there is an error:
ERROR 2002 (HY000): Can't connect to local MySQL server through socket '/run/mysqld/mysqld.sock' (2)
Shout I share some screenshots oder log files via Pastebin?