aaron@Server:~$ ls /boot
abi-4.4.0-42-generic         lost+found
abi-4.4.0-45-generic         memtest86+.bin
config-4.4.0-42-generic      memtest86+.elf
config-4.4.0-45-generic      memtest86+_multiboot.bin
grub                         System.map-4.4.0-42-generic
initrd.img-4.4.0-36-generic  System.map-4.4.0-45-generic
initrd.img-4.4.0-38-generic  vmlinuz-4.4.0-42-generic
initrd.img-4.4.0-42-generic  vmlinuz-4.4.0-45-generic
initrd.img-4.4.0-45-generic
aaron@Server:~$ sudo apt-get autoremove
[sudo] password for aaron: 
Reading package lists... Done
Building dependency tree       
Reading state information... Done
0 upgraded, 0 newly installed, 0 to remove and 0 not upgraded.
aaron@Server:~$