dpkg --configure -a
Setting up initramfs-tools (0.122ubuntu8.5) ...
update-initramfs: deferring update (trigger activated)
Setting up linux-image-4.4.0-51-generic (4.4.0-51.72) ...
Running depmod.
update-initramfs: deferring update (hook will be called later)
The link /initrd.img is a dangling linkto /boot/initrd.img-4.4.0-51-generic
vmlinuz(/boot/vmlinuz-4.4.0-51-generic
) points to /boot/vmlinuz-4.4.0-51-generic
 (/boot/vmlinuz-4.4.0-51-generic) -- doing nothing at /var/lib/dpkg/info/linux-image-4.4.0-51-generic.postinst line 491.
Examining /etc/kernel/postinst.d.
run-parts: executing /etc/kernel/postinst.d/apt-auto-removal 4.4.0-51-generic /boot/vmlinuz-4.4.0-51-generic
N: Ignoring file '50unattended-upgrades.ucf-dist' in directory '/etc/apt/apt.conf.d/' as it has an invalid filename extension
N: Ignoring file '50unattended-upgrades.ucf-dist' in directory '/etc/apt/apt.conf.d/' as it has an invalid filename extension
N: Ignoring file '50unattended-upgrades.ucf-dist' in directory '/etc/apt/apt.conf.d/' as it has an invalid filename extension
run-parts: executing /etc/kernel/postinst.d/dkms 4.4.0-51-generic /boot/vmlinuz-4.4.0-51-generic
ERROR: Cannot create report: [Errno 17] File exists: '/var/crash/iwlwifi-3.16.2-dkms.0.crash'
Error! Bad return status for module build on kernel: 4.4.0-51-generic (x86_64)
Consult /var/lib/dkms/iwlwifi-3.16.2/1.0/build/make.log for more information.
Error!  The dkms.conf for this module includes a BUILD_EXCLUSIVE directive which
does not match this kernel/arch.  This indicates that it should not be built.
Error!  The dkms.conf for this module includes a BUILD_EXCLUSIVE directive which
does not match this kernel/arch.  This indicates that it should not be built.
run-parts: executing /etc/kernel/postinst.d/initramfs-tools 4.4.0-51-generic /boot/vmlinuz-4.4.0-51-generic
update-initramfs: Generating /boot/initrd.img-4.4.0-51-generic
E: /usr/share/initramfs-tools/hooks/casper-memdisk failed with return 1.
update-initramfs: failed for /boot/initrd.img-4.4.0-51-generic with 1.
run-parts: /etc/kernel/postinst.d/initramfs-tools exited with return code 1
Failed to process /etc/kernel/postinst.d at /var/lib/dpkg/info/linux-image-4.4.0-51-generic.postinst line 1052.
dpkg: error processing package linux-image-4.4.0-51-generic (--configure):
 subprocess installed post-installation script returned error exit status 2
dpkg: dependency problems prevent configuration of linux-image-generic:
 linux-image-generic depends on linux-image-4.4.0-51-generic; however:
  Package linux-image-4.4.0-51-generic is not configured yet.

dpkg: error processing package linux-image-generic (--configure):
 dependency problems - leaving unconfigured
dpkg: dependency problems prevent configuration of linux-image-extra-4.4.0-51-generic:
 linux-image-extra-4.4.0-51-generic depends on linux-image-4.4.0-51-generic; however:
  Package linux-image-4.4.0-51-generic is not configured yet.

dpkg: error processing package linux-image-extra-4.4.0-51-generic (--configure):
 dependency problems - leaving unconfigured
dpkg: dependency problems prevent configuration of linux-generic:
 linux-generic depends on linux-image-generic (= 4.4.0.51.54); however:
  Package linux-image-generic is not configured yet.

dpkg: error processing package linux-generic (--configure):
 dependency problems - leaving unconfigured
Processing triggers for initramfs-tools (0.122ubuntu8.5) ...
update-initramfs: Generating /boot/initrd.img-3.13.0-101-generic
E: /usr/share/initramfs-tools/hooks/casper-memdisk failed with return 1.
update-initramfs: failed for /boot/initrd.img-3.13.0-101-generic with 1.
dpkg: error processing package initramfs-tools (--configure):
 subprocess installed post-installation script returned error exit status 1
Errors were encountered while processing:
 linux-image-4.4.0-51-generic
 linux-image-generic
 linux-image-extra-4.4.0-51-generic
 linux-generic