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I have notify-send and all the requirments installed, but when I run a simple command

notify-send "Test" "Test Message"

nothing happens, but if I run the same command through sudo, it works.

System processes can send notifications with no problem, so I see a popup when I join a new wireless LAN, for example.

What group do I need to be a member of in order to send notifications?

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Check the owner of the notify-osd process:

ps -e -o fname,user | grep notify-o

On my system, it is the current user. If it is not, try killing the process and restart it as current user.

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No, notify-osd is running as me. – Stuart Grimshaw Feb 1 '12 at 13:48
Are any of the following questions related?…… – krlmlr Feb 1 '12 at 15:27
No, I have all the deps installed and AFAIK, I have nothing inhibiting the screensaver, it does indeed start after a period of inactivity. The fact I can run it as root just makes it feel like a problem with permissions. – Stuart Grimshaw Feb 1 '12 at 16:24
Well, other people have problems running it as root... – krlmlr Feb 2 '12 at 8:32

For me the problem was that there are too notifications acumulated. if you try notification-properties > prewiew. It tells you. You should restart notification-daemon:

sudo killall notification-daemon
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