After today's d-u, there is a problem with pulseaudio and pavucontrol. Upon starting X (eg. systemctl start lightdm), or in a user terminal issueing start-pulsaudio-x11, the directory /run/user/1000/pulse is created with root ownership. This means the user has no access to pavucontrol, and some audio-using packages, like skype, don't have audio. Fix it in a root terminal with "chown -R user:user /run/user/1000/pulse".