How to resolve the "/lib/modules/3.13.0-27-generic/build: No such file or directory" error message?

you need to install linux-headers-3.13.0-27-generic package

sudo apt-get install linux-headers-3.13.0-27-generic

or better

sudo apt-get install linux-headers-`uname -r`

this will provide the link /lib/modules/3.13.0-27-generic/build


I was using a kernel (v3.13) that is not meant to be used with the distro version I'm using (Ubuntu 14.10).

So I installed the latest possible kernel for my distro by running the following command:

sudo apt-get install linux-generic

It fixed my brightness issue too !