I am newbie in Linux and I was trying to fix problem with skype (it is muted) and I accidentally removed almost all my applications ( I don't have anything to control my desktop settings, mouse, keyboard etc. ) from "System Settings"! How can I get it back? I didn't do backup or anything like this. I wrote these three commands and they seem to have cause the issue:
killall pulseaudio
sudo apt-get remove pulseaudio
sudo apt-get install esound