apt

#Remove Automatically Installed Packages

The following packages were automatically installed and are no longer required:
  libsensors4 linux-headers-4.2.0-16 linux-headers-4.2.0-16-generic linux-headers-4.2.0-19
  linux-headers-4.2.0-19-generic linux-headers-4.2.0-22 linux-headers-4.2.0-22-generic
  linux-headers-4.2.0-23 linux-headers-4.2.0-23-generic linux-image-4.2.0-16-generic
  linux-image-4.2.0-19-generic linux-image-4.2.0-22-generic linux-image-4.2.0-23-generic
  linux-image-extra-4.2.0-16-generic linux-image-extra-4.2.0-19-generic
  linux-image-extra-4.2.0-22-generic linux-image-extra-4.2.0-23-generic sysstat
Use 'apt-get autoremove' to remove them.

apt-get autoremove to remove with a prompt, apt-get autoremove -y to continue without confirmation.