Magento 2.1.18 is the final 2.1.x release. After June 2019, Magento 2.1.x will no longer receive security patches, quality fixes, or documentation updates.
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Install sample data after Magento

The following topics discuss how to install optional sample data after you have already installed the Magento software. There is one additional step compared to pre-installation, which is to update the Magento database schema and data.

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