Administration - Installation - Core: Re(4): Database Connection: database cant be reached

What happens if you do a

GRANT ALL PRIVILEGES ON *.* TO 'ilias'@'localhost' WITH GRANT OPTION;

I think the issue being that you're doing
GRANT LOCK TABLES on *.* TO 'ilias@localhost';

vs

GRANT LOCK TABLES on *.* TO 'ilias'@'localhost';

The quotation marks will matter.