Setting up database...A database query syntax error has occurred. This may indicate a bug in the software. The last attempted database query was:

    CREATE DATABASE `my_wiki`

from within function "MysqlInstaller::setupDatabase". Database returned error "1006: Can't create database 'my_wiki' (errno: 13) (localhost)".

Backtrace:

#0 /var/www/core/includes/db/Database.php(920): DatabaseBase->reportQueryError('Can't create da...', 1006, 'CREATE DATABASE...', 'MysqlInstaller:...', false)
#1 /var/www/core/includes/installer/MysqlInstaller.php(469): DatabaseBase->query('CREATE DATABASE...', 'MysqlInstaller:...')
#2 [internal function]: MysqlInstaller->setupDatabase(Object(MysqlInstaller))
#3 /var/www/core/includes/installer/Installer.php(1445): call_user_func(Array, Object(MysqlInstaller))
#4 /var/www/core/includes/installer/WebInstallerPage.php(1158): Installer->performInstallation(Array, Array)
#5 /var/www/core/includes/installer/WebInstaller.php(269): WebInstaller_Install->execute()
#6 /var/www/core/mw-config/index.php(50): WebInstaller->execute(Array)
#7 /var/www/core/mw-config/index.php(18): wfInstallerMain()
#8 {main}