root@ubuntu1204:/etc/apt# dpkg -r linux-headers-generic-lts-raring
(Reading database ... 429482 files and directories currently installed.)
Removing linux-headers-generic-lts-raring ...
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-generic-lts-raring : Depends: linux-headers-generic-lts-raring but it is not installed
E: Unmet dependencies. Try using -f.