root@summakor:/boot# ls
abi-4.10.0-26-generic
abi-4.10.0-994-generic
abi-4.11.0-999-generic
abi-4.12.0-994-generic
config-4.10.0-26-generic
config-4.10.0-994-generic
config-4.11.0-999-generic
config-4.12.0-994-generic
efi
grub
initrd.img-4.10.0-994-generic
initrd.img-4.11.0-994-generic.i915-fw.backup
initrd.img-4.11.0-999-generic
initrd.img-4.6.0-040600-generic.i915-fw.backup
initrd.img-4.8.0-040800-generic.i915-fw.backup
lost+found
memtest86+.bin
memtest86+.elf
memtest86+_multiboot.bin
System.map-4.10.0-26-generic
System.map-4.10.0-994-generic
System.map-4.11.0-999-generic
System.map-4.12.0-994-generic
vmlinuz-4.10.0-26-generic
vmlinuz-4.10.0-994-generic
vmlinuz-4.11.0-999-generic
vmlinuz-4.12.0-994-generic
root@summakor:/boot# apt remove linux-headers-4.10.0-26-generic
Reading package lists... Done
Building dependency tree       
Reading state information... Done
You might want to run 'apt --fix-broken install' to correct these.
The following packages have unmet dependencies:
 linux-headers-generic : Depends: linux-headers-4.10.0-26-generic but it is not going to be installed
 linux-image-generic : Depends: linux-image-extra-4.10.0-26-generic but it is not going to be installed
E: Unmet dependencies. Try 'apt --fix-broken install' with no packages (or specify a solution).
root@summakor:/boot#