$ sudo apt-get purge linux-headers-generic
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-generic : Depends: linux-headers-generic (= 3.13.0.108.116) but it is not going to be installed
N: Ignoring file '20auto-upgrades.ucf-dist' in directory '/etc/apt/apt.conf.d/' as it has an invalid filename extension
E: Unmet dependencies. Try 'apt-get -f install' with no packages (or specify a solution).
$ dpkg -l | egrep linux-headers-generic
iU  linux-headers-generic                3.13.0.108.116                    amd64        Generic Linux kernel headers