Further, here is an extract of /var/log/messages for the attempted reinstall, surpressing the timestamp and dracut indicator.
dracut-046-8.git20180105.fc27 Executing: /usr/bin/dracut /boot/7725dfc225d14958a625ddaaaea5962b/4.15.9-300.fc27.x86_64/initrd 4.15.9-300.fc27.x86_64 dracut module 'busybox' will not be installed, because command 'busybox' could not be found! dracut module 'busybox' will not be installed, because command 'busybox' could not be found! *** Including module: bash *** *** Including module: systemd *** *** Including module: systemd-initrd *** *** Including module: nss-softokn *** *** Including module: i18n *** *** Including module: network *** *** Including module: ifcfg *** *** Including module: drm *** *** Including module: plymouth *** *** Including module: dm *** Skipping udev rule: 64-device-mapper.rules Skipping udev rule: 60-persistent-storage-dm.rules Skipping udev rule: 55-dm.rules *** Including module: kernel-modules *** *** Including module: kernel-network-modules *** *** Including module: lvm *** Skipping udev rule: 64-device-mapper.rules Skipping udev rule: 56-lvm.rules Skipping udev rule: 60-persistent-storage-lvm.rules *** Including module: resume *** *** Including module: rootfs-block *** *** Including module: terminfo *** *** Including module: udev-rules *** Skipping udev rule: 40-redhat.rules Skipping udev rule: 50-firmware.rules Skipping udev rule: 50-udev.rules Skipping udev rule: 91-permissions.rules Skipping udev rule: 80-drivers-modprobe.rules *** Including module: biosdevname *** *** Including module: dracut-systemd *** *** Including module: usrmount *** *** Including module: base *** *** Including module: fs-lib *** *** Including module: shutdown *** *** Including modules done *** *** Installing kernel module dependencies *** *** Installing kernel module dependencies done *** *** Resolving executable dependencies *** *** Resolving executable dependencies done*** *** Hardlinking files *** *** Hardlinking files done *** *** Stripping files *** *** Stripping files done *** *** Generating early-microcode cpio image *** *** Constructing GenuineIntel.bin **** *** Store current command line parameters *** *** Creating image file '/boot/7725dfc225d14958a625ddaaaea5962b/4.15.9-300.fc27.x86_64/initrd' *** *** Creating initramfs image file '/boot/7725dfc225d14958a625ddaaaea5962b/4.15.9-300.fc27.x86_64/initrd' done ***