Trusty kernel is a virtual package?

I've been unable to install linux-generic-lts-trusty for a while now:

julian@julian-laptop-QAT10:~$ sudo aptitude install linux-generic-lts-trusty
The following NEW packages will be installed:
linux-generic-lts-trusty linux-headers-generic-lts-trusty{b}
linux-image-generic-lts-trusty{b}
0 packages upgraded, 3 newly installed, 0 to remove and 38 not upgraded.
Need to get 7,572 B/11.4 kB of archives. After unpacking 86.0 kB will be used.
The following packages have unmet dependencies:
linux-image-generic-lts-trusty : Depends: linux-image-3.13.0-27-generic which is a virtual package.
linux-headers-generic-lts-trusty : Depends: linux-headers-3.13.0-27-generic which is a virtual package.

What's up with that? I know I was able to install it before.