Ubuntu web server hosting Permission denied for Prestashop

[David]

I'm running an Ubuntu web server (Ubuntu Desktop 14.04) at home and I'm using Easy Hosting Control Panel, but I keep having some permission issues with the websites. I uploaded Prestashop through Filezilla and I tried to install it but I got the following error:

An error has occured: Extraction error - No error

When I checked the error logs, I got the following error:

PHP Warning: ZipArchive::extractTo(/var/www/vhosts/website/website.com/httpdocs//tools/htmlpurifier/standalone/HTMLPurifier/EntityLookup/index.php): failed to open stream: Permission denied in /var/www/vhosts/website/website.com/httpdocs/index.php on line 118, referer: http://website.com/

Finally, I tried running the following commands on the terminal without success:

sudo adduser (username) www-data

sudo chown -R www-data:www-data /var/www

sudo chmod -R g+rwX /var/www

[Naldinho]

I don't see why you'd use a panel for an internal server -- this could be an issue caused by the panel.