If you have a KF8 eBook and you want to make sure it is right justified (as long as it has no DRM either it came that way or you stripped the DRM), use the Calibre editor. Do a search/replace to delete all lines that read text-align: justify from the CSS. If you have a body style in CSS, add in text-align: left. If you don't have a body style, add one and then add that line. Then save it and you'll be left justified with a ragged right.
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