The debug output does appear in /var/log/syslog after "sudo udevadm control --log-priority=debug" at least in Ubuntu 14.04 LTS and 14.10, so this apparently got fixed.
** Changed in: systemd (Ubuntu) Status: New => Fix Released -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1303990 Title: Can't get udev debug logs To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/systemd/+bug/1303990/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs