The .desktop extension dont work. For resolve the problem use .thumbnailer extension with the different mime/type content.
For example, for ogg perview : 1 - Create the file : /usr/share/thumbnailers/ogg-thumbnailer.thumbnailer 2 - Put the content : [Thumbnailer Entry] Exec=/usr/bin/totem-video-thumbnailer -s %s %u %o MimeType=application/ogg;application/x-ogg;video/ogg; Or if you have ffmpegthumbnailer installed put the content : [Thumbnailer Entry] Exec=/usr/bin/ffmpegthumbnailer -f -s %s -i %i -o %o MimeType=application/ogg;application/x-ogg;video/ogg; Create other files for all mime/type perview you want. -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/769594 Title: gsettings-desktop-schemas 3.0.0-0ubuntu1 fails to create thumbnailers schema directory /usr/share/thumbnailers and necessary files within -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs