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The new webp image standard is used a lot this days. Somehow Nautilius is not generating thumbnails for this format automatically.
To add support for this just do the following:
STEP 1: Add support for the new image format.
Create a new file /usr/share/thumbnailers/webp.thumbnailer with the following content.
[Thumbnailer Entry]
TryExec=/usr/bin/totem-video-thumbnailer
Exec=/usr/bin/totem-video-thumbnailer -s %s %u %o
MimeType=image/webp;image/x-webp;Also make sure totem player is installed, because we are using the totem thumbnailer to generate the preview images.
STEP 2: Restart Nautilius
$ nautilus -q && nautilus &