cavsfan@cavsfan-le-beast:~$ sudo apt-get upgrade
Reading package lists... Done
Building dependency tree       
Reading state information... Done
Calculating upgrade... Done
The following packages were automatically installed and are no longer required:
  linux-headers-4.3.0-2 linux-headers-4.3.0-2-generic linux-image-4.3.0-2-generic linux-image-extra-4.3.0-2-generic
Use 'sudo apt autoremove' to remove them.
0 upgraded, 0 newly installed, 0 to remove and 0 not upgraded.
cavsfan@cavsfan-le-beast:~$ sudo apt autoremove
Reading package lists... Done
Building dependency tree       
Reading state information... Done
The following packages will be REMOVED:
  linux-headers-4.3.0-2 linux-headers-4.3.0-2-generic linux-image-4.3.0-2-generic linux-image-extra-4.3.0-2-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 ... 250782 files and directories currently installed.)
Removing linux-headers-4.3.0-2-generic (4.3.0-2.11) ...
Removing linux-headers-4.3.0-2 (4.3.0-2.11) ...
Removing linux-image-extra-4.3.0-2-generic (4.3.0-2.11) ...
run-parts: executing /etc/kernel/postinst.d/apt-auto-removal 4.3.0-2-generic /boot/vmlinuz-4.3.0-2-generic
run-parts: executing /etc/kernel/postinst.d/dkms 4.3.0-2-generic /boot/vmlinuz-4.3.0-2-generic
Error! Your kernel headers for kernel 4.3.0-2-generic cannot be found.
Please install the linux-headers-4.3.0-2-generic package,
or use the --kernelsourcedir option to tell DKMS where it's located
run-parts: executing /etc/kernel/postinst.d/initramfs-tools 4.3.0-2-generic /boot/vmlinuz-4.3.0-2-generic
update-initramfs: Generating /boot/initrd.img-4.3.0-2-generic
run-parts: executing /etc/kernel/postinst.d/pm-utils 4.3.0-2-generic /boot/vmlinuz-4.3.0-2-generic
run-parts: executing /etc/kernel/postinst.d/unattended-upgrades 4.3.0-2-generic /boot/vmlinuz-4.3.0-2-generic
run-parts: executing /etc/kernel/postinst.d/update-notifier 4.3.0-2-generic /boot/vmlinuz-4.3.0-2-generic
run-parts: executing /etc/kernel/postinst.d/zz-update-grub 4.3.0-2-generic /boot/vmlinuz-4.3.0-2-generic
Generating grub configuration file ...
Found background image: image-1920x1080.jpg
Adding Arch Linux, Xubuntu Xenial Xerus 16.04 (devel) and Windows 10
done
Removing linux-image-4.3.0-2-generic (4.3.0-2.11) ...
Examining /etc/kernel/prerm.d.
run-parts: executing /etc/kernel/prerm.d/dkms 4.3.0-2-generic /boot/vmlinuz-4.3.0-2-generic
dkms: removing: nvidia-340 340.96 (4.3.0-2-generic) (x86_64)

-------- Uninstall Beginning --------
Module:  nvidia-340
Version: 340.96
Kernel:  4.3.0-2-generic (x86_64)
-------------------------------------

Status: Before uninstall, this module version was ACTIVE on this kernel.
nvidia_340.ko:
 - Uninstallation
   - Deleting from: /lib/modules/4.3.0-2-generic/updates/dkms/
 - Original module
   - No original module was found for this module on this kernel.
   - Use the dkms install command to reinstall any previous module version.


nvidia_340_uvm.ko:
 - Uninstallation
   - Deleting from: /lib/modules/4.3.0-2-generic/updates/dkms/
 - Original module
   - No original module was found for this module on this kernel.
   - Use the dkms install command to reinstall any previous module version.

depmod....

DKMS: uninstall completed.
Examining /etc/kernel/postrm.d .
run-parts: executing /etc/kernel/postrm.d/initramfs-tools 4.3.0-2-generic /boot/vmlinuz-4.3.0-2-generic
update-initramfs: Deleting /boot/initrd.img-4.3.0-2-generic
run-parts: executing /etc/kernel/postrm.d/zz-update-grub 4.3.0-2-generic /boot/vmlinuz-4.3.0-2-generic
Generating grub configuration file ...
Found background image: image-1920x1080.jpg
Adding Arch Linux, Xubuntu Xenial Xerus 16.04 (devel) and Windows 10
done