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UbuntuStudio image builds have recently begun failing as a result of adding a grub theme customization to their flavor, which they then try to apply by running update-grub from their maintainer scripts. This fails with: Setting up plymouth-theme-ubuntustudio (0.57) ... update-alternatives: using /usr/share/plymouth/themes/ubuntustudio-logo/ubuntustudio-logo.plymouth to provide /usr/share/plymouth/themes/default.plymouth (default.plymouth) in auto mode update-alternatives: using /usr/share/plymouth/themes/ubuntustudio-text/ubuntustudio-text.plymouth to provide /usr/share/plymouth/themes/text.plymouth (text.plymouth) in auto mode update-initramfs: diverted by livecd-rootfs (will be called later) /usr/sbin/grub-probe: error: cannot find a device for / (is /dev mounted?). dpkg: error processing package plymouth-theme-ubuntustudio (--configure): installed plymouth-theme-ubuntustudio package post-installation script subprocess returned error exit status 1 Packages providing grub themes should be able to call update-grub from their maintainer scripts, and they should be able to be installed under livecd-rootfs. It's surprising to me that this hasn't been a problem before now for any flavors. We know that grub-probe should not be called as part of an image build, so just use our standard helper function to divert it before running the chroot stage and undivert it after.