gstreamer1.0-fluendo-mp3 it's not available for 18.10 at this time. Please make a request/report at https://launchpad.net/ubuntu/+source/ubuntu-restricted-addons/+bugs
gstreamer1. 0-fluendo- mp3 it's not available for 18.10 at this time. Please make a request/report at https:/ /launchpad. net/ubuntu/ +source/ ubuntu- restricted- addons/ +bugs