root@(none):/# 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-2.6-sb1a-bcm91480b 2.6.32+27
  linux-headers-2.6-sb1-bcm91250a 2.6.32+27
  linux-headers-2.6-r5k-cobalt 2.6.32+27
  linux-headers-2.6-5kc-malta 2.6.32+27
  linux-headers-2.6-4kc-malta 2.6.32+27
  linux-headers-2.6.32-5-sb1a-bcm91480b 2.6.32-15
  linux-headers-2.6.32-5-sb1-bcm91250a 2.6.32-15
  linux-headers-2.6.32-5-r5k-cobalt 2.6.32-15
  linux-headers-2.6.32-5-5kc-malta 2.6.32-15
  linux-headers-2.6.32-5-4kc-malta 2.6.32-15
You should explicitly select one to install.
E: Package linux-headers has no installation candidate