salut,
ouvre le fichier config.php
nano /var/www/rutorrent/conf/config.php
et modifie cette partie
$pathToExternals = array(
"php" => '', // Something like /usr/bin/php. If empty, will be found in PATH.
"curl" => '', // Something like /usr/bin/curl. If empty, will be found in PATH.
"gzip" => '', // Something like /usr/bin/gzip. If empty, will be found in PATH.
"id" => '/usr/bin/id', // Something like /usr/bin/id. If empty, will be found in PATH.
"stat" => '', // Something like /usr/bin/stat. If empty, will be found in PATH.
);