The GStreamer backend of Qt Multimedia has known issues with pulseaudio,
caused by bugs in the time smoother. We therefore install pulseaudio 16
from a PPA on our ubuntu testers.
Task-number: QTBUG-112014
Task-number: QTBUG-124372
Task-number: QTBUG-126799
Pick-to: 6.5
Change-Id: Ifd18ff4b9904ac0ee022c9158e96ebca8768599f
Reviewed-by: Jøger Hansegård <joger.hansegard@qt.io>
Reviewed-by: Dimitrios Apostolou <jimis@qt.io>
(cherry picked from commit cc17f25cd1)
Reviewed-by: Qt Cherry-pick Bot <cherrypick_bot@qt-project.org>
