I am tasked with the process of installing and configuring a LAMP server from scratch for hosting Drupal sites.I have installed the LAMP stack but I'm experiencing multi-user editing problems.Users are not permitted to write into files/directories created by someone else as the following message shows:drush dl admin_menuDirectory /var/www/drupal-7.34/sites/all/modules/admin_menu exists,  [error]but is not writable. Please check directory permissions.I know this is ownership issue resolvable with the chown command but I would like to avoid chown-ing every time someone attempts to edit a file or download a module into a project the person didn't create.Can anyone give me details on how to configure my server so different users can access and edit websites files found in the /var/www directory?
Server setup and configuration
ubuntu;configuration;chown;drupal