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Preparing to unpack .../linux-libc-dev_4.4.0-62.83_amd64.deb ... Unpacking linux-libc-dev:amd64 (4.4.0-62.83) over (4.4.0-59.80) ... Processing triggers for man-db (2.7.5-1) ... Processing triggers for install-info (6.1.0.dfsg.1-5) ... Processing triggers for systemd (229-4ubuntu16) ... Processing triggers for ureadahead (0.100.0-19) ... Processing triggers for libc-bin (2.23-0ubuntu5) ... Setting up initramfs-tools (0.122ubuntu8.8) ... update-initramfs: deferring update (trigger activated) Setting up linux-firmware (1.157.8) ... update-initramfs: Generating /boot/initrd.img-4.4.0-47-generic E: /usr/share/initramfs-tools/hooks/casper failed with return 1. update-initramfs: failed for /boot/initrd.img-4.4.0-47-generic with 1. dpkg: error processing package linux-firmware (--configure): subprocess installed post-installation script returned error exit status 1 Setting up linux-image-4.4.0-62-generic (4.4.0-62.83) ... Running depmod. update-initramfs: deferring update (hook will be called later) Examining /etc/kernel/postinst.d. run-parts: executing /etc/kernel/postinst.d/apt-auto-removal 4.4.0-62-generic /boot/vmlinuz-4.4.0-62-generic run-parts: executing /etc/kernel/postinst.d/initramfs-tools 4.4.0-62-generic /boot/vmlinuz-4.4.0-62-generic update-initramfs: Generating /boot/initrd.img-4.4.0-62-generic E: /usr/share/initramfs-tools/hooks/casper failed with return 1. update-initramfs: failed for /boot/initrd.img-4.4.0-62-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-4.4.0-62-generic.postinst line 1052. dpkg: error processing package linux-image-4.4.0-62-generic (--configure): subprocess installed post-installation script returned error exit status 2