pankaj@pankaj-G31M-S2L:~$ sudo apt-get remove unity
[sudo] password for pankaj: 
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:
 kde-telepathy-minimal : Depends: kde-config-telepathy-accounts (>= 15.04.0) but it is not going to be installed
 ubuntu-desktop : Depends: unity but it is not going to be installed
                  Recommends: gnome-calendar but it is not going to be installed
                  Recommends: ubuntu-software but it is not going to be installed
                  Recommends: unity-accessibility-profiles but it is not going to be installed
 unity-tweak-tool : Depends: unity (>= 6.8) but it is not going to be installed
E: Unmet dependencies. Try 'apt-get -f install' with no packages (or specify a solution).
pankaj@pankaj-G31M-S2L:~$