here is the syslog of that period of the day when it happened. I was browsing internet upon setting up the alarm, then closed browser and then after 45 min the alarm failed. See the attachment.
** Attachment added: "failed alarm syslog" https://bugs.launchpad.net/ubuntu-clock-app/+bug/1472525/+attachment/4573837/+files/Failed%20alarm%20%2C%2CALARM%20PASSED%2C%2C%20syslog -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1472525 Title: Alarm clock is not ringing when the alarm time is coming To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu-clock-app/+bug/1472525/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs