cavsfan@cavsfan-le-beast:~$ sudo apt-get purge linux-headers-4.3.0-1 linux-headers-4.3.0-1-generic linux-image-4.3.0-1-generic linux-image-extra-4.3.0-1-generic
[sudo] password for cavsfan: 
Reading package lists... Done
Building dependency tree       
Reading state information... Done
The following packages will be REMOVED:
  linux-headers-4.3.0-1* linux-headers-4.3.0-1-generic* linux-image-4.3.0-1-generic* linux-image-extra-4.3.0-1-generic*
0 upgraded, 0 newly installed, 4 to remove and 0 not upgraded.
After this operation, 296 MB disk space will be freed.
Do you want to continue? [Y/n] Y
(Reading database ... 249676 files and directories currently installed.)
Removing linux-headers-4.3.0-1-generic (4.3.0-1.10) ...
Removing linux-headers-4.3.0-1 (4.3.0-1.10) ...
Removing linux-image-extra-4.3.0-1-generic (4.3.0-1.10) ...
run-parts: executing /etc/kernel/postinst.d/apt-auto-removal 4.3.0-1-generic /boot/vmlinuz-4.3.0-1-generic
run-parts: executing /etc/kernel/postinst.d/dkms 4.3.0-1-generic /boot/vmlinuz-4.3.0-1-generic
Error! Your kernel headers for kernel 4.3.0-1-generic cannot be found.
Please install the linux-headers-4.3.0-1-generic package,
or use the --kernelsourcedir option to tell DKMS where it's located
Error! Your kernel headers for kernel 4.3.0-1-generic cannot be found.
Please install the linux-headers-4.3.0-1-generic package,
or use the --kernelsourcedir option to tell DKMS where it's located
run-parts: executing /etc/kernel/postinst.d/initramfs-tools 4.3.0-1-generic /boot/vmlinuz-4.3.0-1-generic
update-initramfs: Generating /boot/initrd.img-4.3.0-1-generic