root@ubuntu1204:/etc/apt# apt-get dist-upgrade -y
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-lts-raring : Depends: linux-headers-3.8.0-41-generic but it is not installed
E: Unmet dependencies. Try using -f.