Installation dependencies not met

Details

Errors similar to the following display when you run the installer:

 Magento\Framework\Exception
 Command returned non-zero exit code:
`/usr/bin/php5 -f '/var/www/magento2/dev/shell/run_data_fixtures.php' -- --bootstrap='MAGE_DIRS[base][path]=/var/www/magento2' 2>&1`

[other errors]

Exception
 PHP Fatal error:  Class 'Magento\Framework\Stdlib\DateTime\TimezoneInterface' not found in /var/www/magento2/app/bootstrap.php on line 56

Dependencies not installed. Please run 'composer install' under /setup directory.

Whoops, it looks like setup tool dependencies are not installed.

`/usr/bin/php -f '/var/www/html/magento2/dev/shell/run_data_fixtures.php' -- --bootstrap='MAGE_DIRS[base][path]=/var/www/html/magento2' 2>&1`

 Exception
 PHP Fatal error:  Class 'Magento\Framework\Stdlib\DateTime\TimezoneInterface' not found in /var/www/html/magento2/app/bootstrap.php on line 56

If the web installer stops, informs you that the installation is incomplete, but does not display an error in the console log, the likely cause is you did not run `composer install` from the `/setup` directory. The web installer message is Installation is incomplete. Check the console log for errors before trying again. ### Description You must run `composer install` from *both* the `` and `/setup` directories before installer. ### Suggestion Run composer install from both of the preceding directories and try the installation again.

Installation dependencies not met