Comment 1 for bug 840573

Thank you for taking the time to report this bug and helping to make Ubuntu better. I've corrected the version as 3.1.90 was nerver published according to launchpad[1], anway please execute the following command, as it will automatically gather debugging information, in a terminal:
apport-collect 840573

When reporting bugs in the future please use apport by using 'ubuntu-bug' and the name of the package affected. You can learn more about this functionality at https://wiki.ubuntu.com/ReportingBugs.

[1]: https://launchpad.net/ubuntu/+source/gnome-themes-standard/+publishinghistory