root@Sago-U14:/boot# ls -la
total 63132
drwxr-xr-x  4 root root     4096 Jan  6 20:42 .
drwxr-xr-x 22 root root     4096 Jan  6 19:52 ..
drwxr-xr-x  5 root root     1024 Jan  6 20:42 grub
-rw-r--r--  1 root root 28695091 Jan  6 19:37 initrd.img-3.13.0-92-generic
-rw-r--r--  1 root root 35120440 Jan  6 19:53 initrd.img-4.4.0-57-generic
drwx------  2 root root    12288 Oct 20  2014 lost+found
-rw-r--r--  1 root root   182704 Jan 28  2016 memtest86+.bin
-rw-r--r--  1 root root   184380 Jan 28  2016 memtest86+.elf
-rw-r--r--  1 root root   184840 Jan 28  2016 memtest86+_multiboot.bin
-rw-r--r--  1 root root        0 Jan  6 19:52 vmlinuz-4.4.0-57-generic
root@Sago-U14:/boot#