Quote:
Originally Posted by jhowell
If you see the title and author of the book on the lock screen instead of a cover image then there was a problem in extracting the cover from the book. The cover must be in JPEG format with JFIF (not EXIF) metadata. (That is normally the case if the cover is set during conversion.)
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Thanks!
I opened the following bug in Calibre detailing this issue:
https://bugs.launchpad.net/calibre/+bug/1943495