The thumbnailing service is tumbler. You could try file bug reports at https://bugs.launchpad.net/ubuntu/+source/tumbler
Make sure you have the tumbler-plugins-extra package installed, though.
The thumbnailing service is tumbler. You could try file bug reports at https:/ /bugs.launchpad .net/ubuntu/ +source/ tumbler
Make sure you have the tumbler- plugins- extra package installed, though.