rm: cannot remove ‘/boot/linux-image-extra-3.13.0-39-generic’: No such file or directory
rm: cannot remove ‘/boot/linux-image-extra-3.13.0-40-generic’: No such file or directory
rm: cannot remove ‘/boot/linux-image-extra-3.13.0-43-generic’: No such file or directory
rm: cannot remove ‘/boot/linux-image-extra-3.13.0-44-generic’: No such file or directory
Reading package lists... Done
Building dependency tree       
Reading state information... Done
The following packages were automatically installed and are no longer required:
  linux-headers-3.13.0-52 linux-headers-3.13.0-52-generic
Use 'apt-get autoremove' to remove them.
0 upgraded, 0 newly installed, 0 to remove and 248 not upgraded.