Comment 2 for bug 2037879

Thank you for taking the time to report this bug and helping to make Ubuntu better. The relevant dpkg terminal log says:

update-initramfs: deferring update (trigger activated)
dpkg-maintscript-helper: error: dpkg: error: unknown option --validate-version
[...]
dpkg: error processing package initramfs-tools (--configure):
 subprocess installed post-installation script returned error exit status 1

This should not happen. Which dpkg version do you have installed?

dpkg -l | grep dpkg