Instale os arquivos de cabeçalho:
sudo apt-get install linux-headers-$(uname -r) # or linux-headers-generic.
Desde:
$ apt-cache show linux-source-3.13.0
Package: linux-source-3.13.0
...
Description-en: Linux kernel source for version 3.13.0 with Ubuntu patches
...
If you are simply trying to build third-party modules for your kernel,
you do not want this package. Install the appropriate linux-headers
package instead.