Magento 2.0.18 is the final 2.0.x release. After March 2018, Magento 2.0.x will no longer receive security patches, quality fixes, or documentation updates.
To maintain your site's performance, security, and PCI compliance, upgrade to the latest version of Magento.

After installing, images and stylesheets do not load; only text displays, no graphics


The path to images and stylesheets is not correct, either because of an incorrect base URL or because server rewrites (CentOS, Ubuntu) are not set up properly. To confirm this is the case, use a web browser inspector to check the paths to static assets and verify those assets are located on the Magento file system.

Magento static assets should be located under <your Magento install dir>/pub/static/ (there should be frontend and adminhtml directories).