ericus@greentic:~$ sudo dpkg -l linux-{image,headers}-* | awk '/^ii/{print $2}' | egrep '[0-9]+\.[0-9]+\.[0-9]+' | awk 'BEGIN{FS="-"}; {if ($3 ~ /[0-9]+/) print $3"-"$4,$0; else if ($4 ~ /[0-9]+/) print $4"-"$5,$0}' | sort -k1,1 --version-sort -r | sed -e "1,/$(uname -r | cut -f1,2 -d"-")/d" | grep -v -e `uname -r | cut -f1,2 -d"-"` | awk '{print $2}' | xargs sudo apt-get -y purge
Reading package lists... Done
Building dependency tree
Reading state information... Done
The following packages will be REMOVED:
  linux-headers-4.4.0-81* linux-headers-4.4.0-81-generic* linux-image-4.4.0-81-generic* linux-image-extra-4.4.0-81-generic*
  linux-signed-image-4.4.0-81-generic*
0 upgraded, 0 newly installed, 5 to remove and 15 not upgraded.
After this operation, 297 MB disk space will be freed.
(Reading database ... 296297 files and directories currently installed.)
Removing linux-headers-4.4.0-81-generic (4.4.0-81.104) ...
Removing linux-headers-4.4.0-81 (4.4.0-81.104) ...
Removing linux-signed-image-4.4.0-81-generic (4.4.0-81.104) ...
Generating grub configuration file ...
Warning: Setting GRUB_TIMEOUT to a non-zero value when GRUB_HIDDEN_TIMEOUT is set is no longer supported.
Found linux image: /boot/vmlinuz-4.4.0-83-generic
Found initrd image: /boot/initrd.img-4.4.0-83-generic
Found linux image: /boot/vmlinuz-4.4.0-81-generic
Found initrd image: /boot/initrd.img-4.4.0-81-generic
Adding boot menu entry for EFI firmware configuration
done
Purging configuration files for linux-signed-image-4.4.0-81-generic (4.4.0-81.104) ...
Removing linux-image-extra-4.4.0-81-generic (4.4.0-81.104) ...
run-parts: executing /etc/kernel/postinst.d/apt-auto-removal 4.4.0-81-generic /boot/vmlinuz-4.4.0-81-generic
run-parts: executing /etc/kernel/postinst.d/dkms 4.4.0-81-generic /boot/vmlinuz-4.4.0-81-generic
Error! Your kernel headers for kernel 4.4.0-81-generic cannot be found.
Please install the linux-headers-4.4.0-81-generic package,
or use the --kernelsourcedir option to tell DKMS where it's located
run-parts: executing /etc/kernel/postinst.d/initramfs-tools 4.4.0-81-generic /boot/vmlinuz-4.4.0-81-generic
update-initramfs: Generating /boot/initrd.img-4.4.0-81-generic
run-parts: executing /etc/kernel/postinst.d/pm-utils 4.4.0-81-generic /boot/vmlinuz-4.4.0-81-generic
run-parts: executing /etc/kernel/postinst.d/unattended-upgrades 4.4.0-81-generic /boot/vmlinuz-4.4.0-81-generic
run-parts: executing /etc/kernel/postinst.d/update-notifier 4.4.0-81-generic /boot/vmlinuz-4.4.0-81-generic
run-parts: executing /etc/kernel/postinst.d/zz-update-grub 4.4.0-81-generic /boot/vmlinuz-4.4.0-81-generic
Generating grub configuration file ...
Warning: Setting GRUB_TIMEOUT to a non-zero value when GRUB_HIDDEN_TIMEOUT is set is no longer supported.
Found linux image: /boot/vmlinuz-4.4.0-83-generic
Found initrd image: /boot/initrd.img-4.4.0-83-generic
Found linux image: /boot/vmlinuz-4.4.0-81-generic
Found initrd image: /boot/initrd.img-4.4.0-81-generic
Adding boot menu entry for EFI firmware configuration
done
Purging configuration files for linux-image-extra-4.4.0-81-generic (4.4.0-81.104) ...
Removing linux-image-4.4.0-81-generic (4.4.0-81.104) ...
Examining /etc/kernel/prerm.d.
run-parts: executing /etc/kernel/prerm.d/dkms 4.4.0-81-generic /boot/vmlinuz-4.4.0-81-generic
dkms: removing: bbswitch 0.8 (4.4.0-81-generic) (x86_64)

-------- Uninstall Beginning --------
Module:  bbswitch
Version: 0.8
Kernel:  4.4.0-81-generic (x86_64)
-------------------------------------

Status: Before uninstall, this module version was ACTIVE on this kernel.

bbswitch.ko:
 - Uninstallation
   - Deleting from: /lib/modules/4.4.0-81-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 4.4.0-81-generic /boot/vmlinuz-4.4.0-81-generic
update-initramfs: Deleting /boot/initrd.img-4.4.0-81-generic
run-parts: executing /etc/kernel/postrm.d/zz-update-grub 4.4.0-81-generic /boot/vmlinuz-4.4.0-81-generic
Generating grub configuration file ...
Warning: Setting GRUB_TIMEOUT to a non-zero value when GRUB_HIDDEN_TIMEOUT is set is no longer supported.
Found linux image: /boot/vmlinuz-4.4.0-83-generic
Found initrd image: /boot/initrd.img-4.4.0-83-generic
Adding boot menu entry for EFI firmware configuration
done
The link /vmlinuz.old is a damaged link
Removing symbolic link vmlinuz.old
 you may need to re-run your boot loader[grub]
The link /initrd.img.old is a damaged link
Removing symbolic link initrd.img.old
 you may need to re-run your boot loader[grub]
Purging configuration files for linux-image-4.4.0-81-generic (4.4.0-81.104) ...
Examining /etc/kernel/postrm.d .
run-parts: executing /etc/kernel/postrm.d/initramfs-tools 4.4.0-81-generic /boot/vmlinuz-4.4.0-81-generic
run-parts: executing /etc/kernel/postrm.d/zz-update-grub 4.4.0-81-generic /boot/vmlinuz-4.4.0-81-generic