root@ubuntu:/# ls -l /boot
total 138260
-rw-r--r-- 1 root root 28298371 Feb 18 19:07 initrd.img-3.16.0-30-generic
-rw-r--r-- 1 root root 28308197 Feb 18 19:06 initrd.img-3.16.0-37-generic
-rw-r--r-- 1 root root 28310494 Feb 18 19:06 initrd.img-3.16.0-38-generic
-rw-r--r-- 1 root root 28321513 Feb 18 19:06 initrd.img-3.16.0-53-generic
-rw-r--r-- 1 root root 28322041 Feb 18 19:06 initrd.img-3.16.0-55-generic
root@ubuntu:/#