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I'm not getting any thumbnails in nautilus for my NEF files (photo raw). Is there an easy way to repair this?

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Is this still reproducible? –  Braiam Apr 7 '14 at 0:26
@Braiam Don't know about 14.04, but in 13.10 I had to install those extra packages as in my asnwer for it to work. –  Dan Apr 7 '14 at 7:12

2 Answers 2

By default, Ubuntu doesn’t display thumbnails for NEF files. But you can try (as explained in this blog post) installing UFraw.

sudo apt-get install ufraw

And if itś not already existing, create a thumbnailer file /usr/share/thumbnailers/ufraw.thumbnailer, with content :

[Thumbnailer Entry]
Exec=/usr/bin/ufraw-batch --embedded-image --out-type=png --size=%s %u --overwrite --silent --output=%o

This file basically say to exec ufraw-batch (with the good parameters) on any file with the specified mimetypes (including image/x-nef).

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+1, a small correction needed, it should be /usr/share/thumbnailers instead of /usr/share/thumbnailer –  danijelc Dec 17 '13 at 11:04

You can install the following packages, and Nautilus will start displaying thumbnails for NEF files without having to do any manual configuration.

sudo apt-get install libopenraw1 libopenrawgnome1 gnome-raw-thumbnailer

source: Ubuntu Foums - viewing nikon NEF raw files?

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