Comment 3 for bug 2018458

Thank you for taking the time to report this bug and helping to make Ubuntu better. Please execute the following command only once, as it will automatically gather debugging information, in a terminal:

   apport-collect 2018458

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.

Note: I'm moving his bug report to the xorg-server package which may or may not be correct but at least Ubuntu's Desktop Team will be notified of the problem that you are experiencing.