I have KDE Plasma installed on top of Ubuntu 16.04. And the sound doesn’t work. It works fine in Unity but not in KDE. It worked when I first installed KDE, it broke either when I was trying to get Evolution to work with Exchange or when I was messing around with the widgets on the dock. (The dock widgets are all also shoved way over to the left by the launch button.)
And it boots into the Unity login screen.
How do I go about troubleshooting this? I'm a bit of a Linux noob.