I have a shutdown problem in Lubuntu 13.10 (64-bit) as well. Didn't have it before on Lubuntu 13.04 (32-bit) on the same laptop. Choosing "Shutdown" from the menu does not completely switch off my Dell 1545 laptop. The one indicator light present keeps glowing. I have to pull the power cord out to get that LED to go off.
I haven't tried at the "before you login" step but I will try that after logging out instead of going for a shutdown directly.
However, I have doubts because even sudo shutdown -P now leaves the indicator light on as stated above.
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