root@ip-172-31-23-244:~# apt upgrade
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-generic : Depends: linux-headers-3.13.0-142-generic but it is not installed
E: Unmet dependencies. Try using -f.