root@ubuntu:/# apt-get dist-upgrade
Reading package lists... Done
Building dependency tree       
Reading state information... Done
Calculating upgrade... The following packages were automatically installed and are no longer required:
  chromium-codecs-ffmpeg-extra libkeybinder0 linux-headers-3.19.0-15 linux-headers-3.19.0-15-generic
  linux-image-3.19.0-15-generic linux-image-extra-3.19.0-15-generic
Use 'apt-get autoremove' to remove them.
Done
0 upgraded, 0 newly installed, 0 to remove and 0 not upgraded.
root@ubuntu:/#