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I recently ran into some problem that required I use Boot Repair to repair partitions. That worked fine but I cannot view any thumbnails anymore, all video and image files just show standard icons.

Some help would be appreciated as I haven't been having any luck with this problem.

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Maybe you should install and run dconf-editor and have a look at the values of the following keys : 1) org.gnome.nautilus.preferences show-image-thumbnails 2) org.gnome.nautilus.preferences thumbnail-limit 3) org.gnome.nautilus.icon-view thumbnail-size. – remjg Dec 5 '12 at 21:30

Perhaps try reinstalling gnome keep in mind though that if you have uninstalled unity this may be difficult so an understanding of ALT+FX would be useful

sudo apt-get purge gnome-shell sudo apt-get install gnome-shell

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