Quickstart installation issue
During quickstart installation, it can be an issue in creating configuration.php. This is when the quickstart package, is not put it in the main directory of your site, but in a subfolder in that site.
To avoid this issue, the quickstart should be put it in the main site and not in a subfolder.
For example your site is www.yoursite.com. All the files which are inside quickstart should be in www.yoursite.com and not in www.yoursite.com/quickstart
To add the files in your site, should unzip first the quickstart zip file and use FTP to add it in your site.