Reading package lists... Done
Building dependency tree       
Reading state information... Done
Calculating upgrade... Done
The following packages were automatically installed and are no longer required:
  linux-headers-3.19.0-25 linux-headers-3.19.0-25-generic
  linux-image-3.19.0-25-generic linux-image-extra-3.19.0-25-generic
Use 'apt-get autoremove' to remove them.
The following packages have been kept back:
  linux-generic-lts-vivid linux-generic-lts-wily linux-headers-generic
  linux-headers-generic-lts-vivid linux-headers-generic-lts-wily
  linux-image-generic-lts-vivid linux-image-generic-lts-wily
  linux-signed-generic-lts-vivid linux-signed-image-generic-lts-vivid
0 upgraded, 0 newly installed, 0 to remove and 9 not upgraded.