Thank you for taking the time to report this bug and helping to make Ubuntu better.
Based on the error message in the stacktrace this is the same issue as reported in bug 1788250, so it I'm marking this as a duplicate. Please look at the other bug report to see if there is any missing information that you can provide, or to see if there is a workaround for the bug. Additionally, any further discussion regarding the bug should occur in the other report. Feel free to continue to report any other bugs you may find.
Thank you for taking the time to report this bug and helping to make Ubuntu better.
Based on the error message in the stacktrace this is the same issue as reported in bug 1788250, so it I'm marking this as a duplicate. Please look at the other bug report to see if there is any missing information that you can provide, or to see if there is a workaround for the bug. Additionally, any further discussion regarding the bug should occur in the other report. Feel free to continue to report any other bugs you may find.