ok, after a bit of debugging, looks like phonon4qt5-backend-gstreamer is missing. Doing the following and restarting Quassel will fix the bug :
sudo apt-get install phonon4qt5-backend-gstreamer
ok, after a bit of debugging, looks like phonon4qt5- backend- gstreamer is missing. Doing the following and restarting Quassel will fix the bug :
sudo apt-get install phonon4qt5- backend- gstreamer