After fresh install of the app, it's in a non working state, redirecting to some diagnostic page (ampache/test.php) which says that Composer is missing :
This tests whether Ampache dependencies are installed.
Please download and install Composer from http://getcomposer.org and install it (e.g: mv composer.phar /usr/local/bin/composer) then run composer install --prefer-source --no-interaction on Ampache directory.
After fresh install of the app, it's in a non working state, redirecting to some diagnostic page (ampache/test.php) which says that Composer is missing :
FYI my setup is: