Hi, Error dialog box that I posted was popped up almost at same time when the following syslog was generated.
<Syslog> gnome-shell[15196]: [AppIndicatorSupport-FATAL] unable to update overlay icon Now I found that error dialog box is related to "Update-notifier". Dock icon of Update-notifier is shown when Error dialog popped up (see attached screen shot). When I clicked on "Report Problem" button, Dock icon of Update-notifier disappeared and no further information on this issue was shown. -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1825623 Title: [AppIndicatorSupport-FATAL] unable to update overlay icon To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/gnome-shell-extension-appindicator/+bug/1825623/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs