Your Ubuntu computer connects without your knowledge to some unknown servers. These servers are intended to enable the unity lens applications like music, video, music-store. To get rid of some of these services, you should remove unwanted lenses, using the below commands in a terminal window:
sudo apt-get purge unity-lens-music unity-lens-video unity-lens-files unity-lens-musicstore <enter>
Removing the lenses will result in a slightly faster system.