What package do I install?
>sudo apt-get install linux-headers-`uname -r` Package linux-headers-3.14-2-amd64 is not available, but it is referred to
by another package.
This may mean that the package is missing, has been obsoleted, or is only
available from another source
E: Package 'linux-headers-3.14-2-amd64' has no installation candidate