Calibre on linux tech support

I mentioned on tumblr that I'd gotten REAL FUCKING STUBBORN and spent 3 hours figuring out how to make the deDRM plugin for Calibre on linux work with stuff from Adobe Digital Editions. And sciatrix asked for the full how-to, which was good, because I'd written down just enough to remember where in my search history to go to reconstruct the details, but not enough that I'd actually have been able to repeat the process easily in 6 months or whatever when something inevitably breaks and I have to do it again.

So I'm putting the step-by-step instructions here for anyone else who wants it and also so I can find it again later.

How to use the de-DRM plugin for Calibre on linux with Adobe Digital Editions:

( HOKAY... )

ETA: I fucked up my wine prefix and then I couldn't get ADE 4.5 to work, but this guy's instructions for ADE 2.0 seem to work