Apparently, ADE runs under Wine, except certain features don't work, and in particular, those having to do with DRM, frustratingly enough.
I've had better luck with calibre's viewer just for reading ePubs than with FBreader, but that won't help with the original poster's problem.
I don't buy DRMed ePubs, so I can't offer any useful advice, unfortunately. (Not because I'm that opposed to it--I just have enough to read anyway.)
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