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This installation option applies to Debian Linux, including Ubuntu.
First, install Java: sudo apt-get install openjdk-6-jre
Download the Subsonic .deb package and install it: sudo dpkg -i subsonic-x.x.deb
Notice that the installer configures your system to start Subsonic automatically when booting. After installing, open the Subsonic web page on http://localhost:4040.
Change user
By default the Subsonic process is run as the root user. To improve security it is strongly advised that you run it as a dedicated user with less powerful privileges. You can specify this user by setting the SUBSONIC_USER variable in /etc/default/subsonic.
Note that non-root users are by default not allowed to use ports below 1024. Also make sure to grant the user write permissions in the music directories, otherwise changing album art and tags will fail.
Advanced configuration
To change the port number, Java memory settings or other startup parameters, edit the SUBSONIC_ARGS variable in /etc/default/subsonic. To restart Subsonic, do sudo service subsonic restart
Troubleshooting
Check the logs in /var/subsonic.
Met name het wijzigen van /etc/default/subsonic.