ubuntu@ubuntu:~$ sudo apt-get install silversearcher-ag
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-headers-4.4.0-98-generic : Depends: linux-headers-4.4.0-98 but it is not going to be installed
 linux-image-virtual : Depends: linux-image-4.4.0-98-generic but it is not going to be installed
E: Unmet dependencies. Try 'apt-get -f install' with no packages (or specify a solution).