problem solved, change the settings of the thumbnails, with Ubuntu Tweak
** Changed in: nautilus (Ubuntu)
Status: New = Fix Released
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https://bugs.launchpad.net/bugs/899978
** Attachment added: gconf-editor modification, I put it to 96 was at 16, does
not solve anything
https://bugs.launchpad.net/bugs/899978/+attachment/2619388/+files/Pantallazo%20del%202011-12-04%2018%3A15%3A27.png
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** Attachment added: size of the thumbnails
https://bugs.launchpad.net/ubuntu/+source/nautilus/+bug/899978/+attachment/2619392/+files/Pantallazo%20del%202011-12-04%2018%3A16%3A27.png
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