The following packages were automatically installed and are no longer required:
  linux-headers-4.2.0-38 linux-headers-4.2.0-38-generic linux-headers-4.2.0-39
  linux-headers-4.2.0-39-generic linux-image-4.2.0-38-generic
  linux-image-4.2.0-39-generic linux-image-extra-4.2.0-38-generic
  linux-image-extra-4.2.0-39-generic linux-signed-image-4.2.0-38-generic
  linux-signed-image-4.2.0-39-generic
Use 'sudo apt autoremove' to remove them.