$ sudo apt-get install linux-headers
Reading package lists... Done
Building dependency tree
Reading state information... Done
Package linux-headers is a virtual package provided by:
  linux-headers-versatile 3.2+44
  linux-headers-orion5x 3.2+44
  linux-headers-mv78xx0 3.2+44
  linux-headers-kirkwood 3.2+44
  linux-headers-ixp4xx 3.2+44
  linux-headers-iop32x 3.2+44
  linux-headers-3.2.0-2-versatile 3.2.19-1
  linux-headers-3.2.0-2-orion5x 3.2.19-1
  linux-headers-3.2.0-2-mv78xx0 3.2.19-1
  linux-headers-3.2.0-2-kirkwood 3.2.19-1
  linux-headers-3.2.0-2-ixp4xx 3.2.19-1
  linux-headers-3.2.0-2-iop32x 3.2.19-1
You should explicitly select one to install.

E: Package 'linux-headers' has no installation candidate