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I just want to ask if someone got the same problem. Basically dolphin don't generate thumbnail for jpeg images. And yes, thumbnail are enabled in dolphin. In fact old preview are still showed. Following some step on this thread (https://forum.kde.org/viewtopic.php?f=223&t=110177) I found that an error is raised from /usr/lib/kde4/jpegthumbnail.so when the system try to generate the thumbnail.
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