I’d have some trouble, too.
That’s what I did:
1.)
$ sudo apt-get install ffmpeg
2.)
$ sudo apt-get install curl
3.)
$ sudo apt-get install cifs-utils
4.)
$ curl -O http://download.roonlabs.com/builds/roonserver-installer-linuxx64.sh
$ chmod +x roonserver-installer-linuxx64.sh
$ sudo ./roonserver-installer-linuxx64.sh
Now it is working perfect.