F17 boot fails. Drops to dracut debug shell.

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http://forums.fedoraforum.org – I've begun having a problem booting F17. I get "dracut warning: unable to process initqueue" and then "dracut warning: /dev/disk-by-uuid .... does not exist". I'm then dropped into a dracut debug shell. The PC has a single HDD, no RAID or LVM. The HDD has multiple partitions. The PC is dual-boot: F17 and Ubuntu 12.04. The grub2 entry for F17 contains a kernel line "vmlinuz.....root=UUID=.......". The UUID in this line is the same UUID listed in the dracut warning message. Ubuntu 12.04 continues to boot normally. From the dracut debug shell when I issue &quot (HowTos)