Thank you for taking the time to report this bug and helping to make Ubuntu better. gnome-system-monitor shouldn't be able to crash the X server, so I've reassigned your bug to xorg for now. Please could you trigger the crash, and then attach your old X server log file (/var/log/Xorg.0.log.old) when you log in to the next session after the crash. This should hopefully contain a backtrace of the crash.
Thank you for taking the time to report this bug and helping to make Ubuntu better. gnome-system- monitor shouldn't be able to crash the X server, so I've reassigned your bug to xorg for now. Please could you trigger the crash, and then attach your old X server log file (/var/log/ Xorg.0. log.old) when you log in to the next session after the crash. This should hopefully contain a backtrace of the crash.
Thanks in advance.