As you can see performing apt-cache depends indicator-sound it recommends unity-control-center, gnome-control-center or ubuntu-system-settings which hurt Lubuntu motto.
As apt-get install recommended package, please, change these packages to Suggests or add lubuntu-default-settings as a alternative to these packages.
After last Lubuntu update it became dependent of indicator- sound-gtk2, but when installed it brings some strange packages for LXDE.
Having Lubuntu 16.04 LTS clean installed, perform a dist-upgrade, you could apt-mark hold lubuntu- default- settings before to see the exact problem.
It was prior filed here: /bugs.launchpad .net/ubuntu/ +source/ lubuntu- meta/+bug/ 1710993/ comments/ 30
https:/
As you can see performing apt-cache depends indicator-sound it recommends unity-control- center, gnome-control- center or ubuntu- system- settings which hurt Lubuntu motto.
As apt-get install recommended package, please, change these packages to Suggests or add lubuntu- default- settings as a alternative to these packages.