The package is installed (otherwise, you won't see the application in Additional Apps -> RoundCube)
To be 100% sure, please check
dpkg -l | grep roundcube (if you run Debian)
rpm -qa | grep roundcube (if you run CentOS)
Is N is up and runningginx?
If yes, the file /etc/nginx/vhosts-includes/roundcube-nginx.conf с location /roundcube must be present. Make sure that the configuration file has include /etc/nginx/vhosts-includes/*.conf;
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