I installed the Faience theme (sudo apt-get install Faience) and it installed fine. Then I tried installing another package and it said this...

Reading package lists... Done
Building dependency tree       
Reading state information... Done
You might want to run 'apt-get -f install' to correct these:
The following packages have unmet dependencies:
 faience : Depends: faenza but it is not going to be installed
 gnome-shell-extensions-user-theme : Depends: gnome-shell-extensions-common but it is not going to be installed
E: Unmet dependencies. Try 'apt-get -f install' with no packages (or specify a solution).

Please help :O!