Preparing to unpack .../base-files_9.4ubuntu4.4_amd64.deb ...
Unpacking base-files (9.4ubuntu4.4) over (9.4ubuntu4) ...
Processing triggers for plymouth-theme-ubuntu-text (0.9.2-3ubuntu13) ...
update-initramfs: deferring update (trigger activated)
Processing triggers for man-db (2.7.5-1) ...
Processing triggers for cracklib-runtime (2.9.2-1build2) ...
Processing triggers for install-info (6.1.0.dfsg.1-5) ...
Processing triggers for initramfs-tools (0.122ubuntu8) ...
update-initramfs: Generating /boot/initrd.img-4.4.0-66-generic
Setting up base-files (9.4ubuntu4.4) ...
Installing new version of config file /etc/issue ...
Installing new version of config file /etc/issue.net ...
Installing new version of config file /etc/lsb-release ...
Installing new version of config file /etc/update-motd.d/10-help-text ...
Processing triggers for plymouth-theme-ubuntu-text (0.9.2-3ubuntu13) ...
update-initramfs: deferring update (trigger activated)
Processing triggers for initramfs-tools (0.122ubuntu8) ...
update-initramfs: Generating /boot/initrd.img-4.4.0-66-generic
dpkg: cycle found while processing triggers:
 chain of packages whose triggers are or may be responsible:
  initramfs-tools -> initramfs-tools
 packages' pending triggers which are or may be unresolvable:
  initramfs-tools: update-initramfs
dpkg: error processing package initramfs-tools (--configure):
 triggers looping, abandoned