I am also seeing this under Ubuntu 17.10 Using System76 Kudu Laptop, (named 'galactica' in below syslogd snippet)
Gnome suddenly fell apart, it dropped to a console window, and I had to hard reboot w/ the power button. My syslogd had: Jan 26 00:38:04 galactica org.gnome.Shell.desktop[1431]: Window manager warning: 0x2a00001 (Wolf attac) appears to be one of the offen ding windows with a timestamp of 33630142. Working around... Jan 26 00:38:04 galactica org.gnome.Shell.desktop[1431]: Window manager warning: last_user_time (33630203) is greater than comparison timestamp (33630193). This most likely represents a buggy client sending inaccurate timestamps in messages such as _NET_ACTIVE_WINDOW . Trying to work around... Jan 26 00:38:04 galactica org.gnome.Shell.desktop[1431]: Window manager warning: 0x2a00001 (Wolf attac) appears to be one of the offen ding windows with a timestamp of 33630203. Working around... -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/561294 Title: Not a helpful or appropiate error message displayed To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/metacity/+bug/561294/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs