I'm currently on 15.04 (Vivid Vervet) and I can't seem to get any notifications to show unless they're sent with the urgency set to critical, like so:
notify-send -u critical "IRC" "This is a critical IRC notification
unlike this, which doesn't work:
notify-send -u normal "IRC" "This is a normal IRC notification"
I'm using this as a test to troubleshoot irssi-libnotify, which is sending the notifications to the server correctly, but they aren't being shown because they're normal-urgency. I would rather not modify the python script as a work around, since this might be an issue for future packages.