same here with my external usb toshiba 160g hdd on lucid lynx
dmesg | tail -n 10
[69768.736339] hub 2-0:1.0: unable to enumerate USB device on port 1
[69769.084464] hub 2-0:1.0: unable to enumerate USB device on port 1
[69769.436795] hub 2-0:1.0: unable to enumerate USB device on port 1
i was able to solve mine
Solution:
as root
modprobe usb-storage
modprobe vfat
modprobe fat
modprobe ntfs
it pluged back in afterwards and it mounted automatically =D
hope this helps
obs: i had two fs on my drive
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USB devices work, but constant syslog errors unable to enumerate USB device on