And in turn this makes subsequent kernel upgrades croak:
% sudo dpkg --configure -a Setting up linux-image-4.9.0-8-amd64 (4.9.144-3.1) ... /etc/kernel/postinst.d/initramfs-tools: update-initramfs: Generating /boot/initrd.img-4.9.0-8-amd64 /etc/kernel/postinst.d/zz-update-grub: /usr/sbin/grub-probe: error: failed to get canonical path of `/dev/mapper/oldvgname-lvroot'. run-parts: /etc/kernel/postinst.d/zz-update-grub exited with return code 1 dpkg: error processing package linux-image-4.9.0-8-amd64 (--configure): subprocess installed post-installation script returned error exit status 1 Errors were encountered while processing: linux-image-4.9.0-8-amd64 -- 2. That which causes joy or happiness.