purging all unwanted headers

gistfile1.txt

$ sudo apt-get purge                     \
    linux-headers-3.13.0-100             \
    linux-headers-3.13.0-100-generic     \
    linux-headers-3.13.0-91              \
    linux-headers-3.13.0-91-generic      \
    linux-headers-3.13.0-92              \
    linux-headers-3.13.0-92-generic      \
    linux-headers-3.13.0-93              \
    linux-headers-3.13.0-93-generic      \
    linux-headers-3.13.0-96              \
    linux-headers-3.13.0-96-generic      \
    linux-image-3.13.0-100-generic       \
    linux-image-3.13.0-101-generic       \
    linux-image-3.13.0-92-generic        \
    linux-image-3.13.0-93-generic        \
    linux-image-3.13.0-96-generic        \
    linux-image-extra-3.13.0-100-generic \
    linux-image-extra-3.13.0-101-generic \
    linux-image-extra-3.13.0-92-generic  \
    linux-image-extra-3.13.0-93-generic  \
    linux-image-extra-3.13.0-96-generic

Reading package lists... Done
Building dependency tree
Reading state information... Done
The following packages were automatically installed and are no longer required:
  grub-common grub-gfxpayload-lists grub-pc grub-pc-bin grub2-common
Use 'apt-get autoremove' to remove them.
The following packages will be REMOVED:
  linux-headers-3.13.0-100* linux-headers-3.13.0-100-generic*
  linux-headers-3.13.0-91* linux-headers-3.13.0-91-generic*
  linux-headers-3.13.0-92* linux-headers-3.13.0-92-generic*
  linux-headers-3.13.0-93* linux-headers-3.13.0-93-generic*
  linux-headers-3.13.0-96* linux-headers-3.13.0-96-generic*
  linux-image-3.13.0-100-generic* linux-image-3.13.0-101-generic*
  linux-image-3.13.0-92-generic* linux-image-3.13.0-93-generic*
  linux-image-3.13.0-96-generic* linux-image-extra-3.13.0-100-generic
  linux-image-extra-3.13.0-101-generic linux-image-extra-3.13.0-92-generic
  linux-image-extra-3.13.0-93-generic* linux-image-extra-3.13.0-96-generic*
0 upgraded, 0 newly installed, 20 to remove and 7 not upgraded.
10 not fully installed or removed.
After this operation, 1,117 MB disk space will be freed.
Do you want to continue? [Y/n] y
(Reading database ... 183687 files and directories currently installed.)
Removing linux-image-extra-3.13.0-100-generic (3.13.0-100.147) ...
run-parts: executing /etc/kernel/postinst.d/apt-auto-removal 3.13.0-100-generic /boot/vmlinuz-3.13.0-100-generic
run-parts: executing /etc/kernel/postinst.d/initramfs-tools 3.13.0-100-generic /boot/vmlinuz-3.13.0-100-generic
update-initramfs: Generating /boot/initrd.img-3.13.0-100-generic
E: /usr/share/initramfs-tools/hooks/fixrtc failed with return 1.
update-initramfs: failed for /boot/initrd.img-3.13.0-100-generic with 1.
run-parts: /etc/kernel/postinst.d/initramfs-tools exited with return code 1
dpkg: error processing package linux-image-extra-3.13.0-100-generic (--remove):
 subprocess installed post-removal script returned error exit status 1
Errors were encountered while processing:
 linux-image-extra-3.13.0-100-generic
E: Sub-process /usr/bin/dpkg returned an error code (1)