I'm sorry, but this was wrongly triaged as a critical bug in initramfs-tools, when in fact it appears to be a bug in some software not originating in Ubuntu. The error in your logs was:
> update-initramfs: Generating /boot/initrd.img-3.13.0-108-generic
> E: /usr/share/initramfs-tools/hooks/casper-memdisk failed with return 1.
> update-initramfs: failed for /boot/initrd.img-3.13.0-108-generic with 1.
> dpkg: error processing package linux-firmware (--configure):
> subprocess installed post-installation script returned error exit status 1
There is no script named /usr/share/initramfs-tools/hooks/casper-memdisk as part of any package in the Ubuntu archive.
I'm sorry, but this was wrongly triaged as a critical bug in initramfs-tools, when in fact it appears to be a bug in some software not originating in Ubuntu. The error in your logs was:
> update-initramfs: Generating /boot/initrd. img-3.13. 0-108-generic initramfs- tools/hooks/ casper- memdisk failed with return 1. img-3.13. 0-108-generic with 1.
> E: /usr/share/
> update-initramfs: failed for /boot/initrd.
> dpkg: error processing package linux-firmware (--configure):
> subprocess installed post-installation script returned error exit status 1
There is no script named /usr/share/ initramfs- tools/hooks/ casper- memdisk as part of any package in the Ubuntu archive.