root@ubuntu:~# apt-get install linux-image-generic
Reading package lists... Done
Building dependency tree       
Reading state information... Done
linux-image-generic is already the newest version.
linux-image-generic set to manually installed.
0 upgraded, 0 newly installed, 0 to remove and 1 not upgraded.
root@ubuntu:~# apt-get install --reinstall linux-image-generic
Reading package lists... Done
Building dependency tree       
Reading state information... Done
0 upgraded, 0 newly installed, 1 reinstalled, 0 to remove and 1 not upgraded.
Need to get 0 B/2,346 B of archives.
After this operation, 0 B of additional disk space will be used.
(Reading database ... 196601 files and directories currently installed.)
Preparing to unpack .../linux-image-generic_3.13.0.55.62_amd64.deb ...
Unpacking linux-image-generic (3.13.0.55.62) over (3.13.0.55.62) ...
Setting up linux-image-generic (3.13.0.55.62) ...
root@ubuntu:~#