Server-id, mariadb-secure-installation and many more

Starting with version 12.0.1 many mistake are taken over to the version 12.1.2
1) only with sudo can mariadb-secure-installtion be operated. Is this intended?
2)server-id is not to change in the 50-servercnf and is 1, only with SET GLOBAL server_id=2; is this to change until server restart, what result again in server-id=1 on the slave with as result same ID for master and slave.
3)Although the replication user and password are correct and able to use this in the statement mariadb --host=ip-adress --user=replusr -p in a terminal, The actual replication status with SHOSLAVE STATUS\G; give Last_IO_Error: Master command COM_REGISTER_SLAVE failed: Access denied for user 'replusr'@'%' (using password: YES) (Errno: 1045)