sudo apt-get install intel-microcode
Reading package lists... Done
Building dependency tree       
Reading state information... Done
intel-microcode is already the newest version (3.20151106.1).
The following packages were automatically installed and are no longer required:
  bbswitch-dkms libllvm3.8:i386 linux-headers-4.4.0-21
  linux-headers-4.4.0-21-generic linux-image-4.4.0-21-generic
  linux-image-extra-4.4.0-21-generic primus-libs primus-libs:i386
  primus-libs-ia32:i386 socat
Use 'sudo apt autoremove' to remove them.
0 to upgrade, 0 to newly install, 0 to remove and 0 not to upgrade.