Comment 55 for bug 292086

@chris: as the proposed kernel is changing number you'll have to explicitely install it.

sudo apt-cache search linux-image-2.6.27-12
linux-image-2.6.27-12-generic - Linux kernel image for version 2.6.27 on x86/x86_64
linux-image-2.6.27-12-server - Linux kernel image for version 2.6.27 on x86/x86_64
linux-image-2.6.27-12-virtual - Linux kernel image for version 2.6.27 on x86/x86_64
andres@vostro:~$ sudo apt-cache policy linux-image-2.6.27-12
W: No se ha podido localizar el paquete linux-image-2.6.27-12
andres@vostro:~$ sudo apt-cache policy linux-image-2.6.27-12-generic
linux-image-2.6.27-12-generic:
  Instalados: (ninguno)
  Candidato: 2.6.27-12.28
  Tabla de versión:
     2.6.27-12.28 0
        500 http://co.archive.ubuntu.com intrepid-proposed/main Packages

use sudo apt-get install linux-image-2.6.27-12-generic

and you'll get it