sudo apt-get autoremove --purge
[sudo] password for crs: 
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:
 linux-image-extra-3.16.0-55-generic : Depends: linux-image-3.16.0-55-generic but it is not installed
 linux-image-generic-lts-utopic : Depends: linux-image-3.16.0-55-generic but it is not installed
E: Unmet dependencies. Try using -f.