He meant to attach a sample image to the bug, one that was causing the problem. 
But I think it may be something simpler. You should check ~/.local/share/mime/ 
and make sure you don't have an entries overriding JPG's MIME entry. The likely 
culprit is in ~/.local/share/mime/globs, a line something like the following 
might have crept in:
application/x-extension-jpg:*.jpg
If so, comment it out by adding "# " in front of it (note the space).
# application/x-extension-jpg:*.jpg

Nautilus's thumbnailer is looking for images with specific content types
(mime-types), and application/x-extension-jpg isn't on the list (as it
should be reporting image/jpeg for a jpg image). Certain applications
(F-Spot in particular) have been known to override this entry in the
past for whatever reasons.

-- 
nautilus don't show thumbnails for jpg images
https://bugs.launchpad.net/bugs/198154
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