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I installed the system a few days ago, and have yet to see any notifications appear, even test ones. I installed libnotify and have tried both the default cinnamon notification server, as well as the gnome notification-daemon. Nothing has shown any sign of notifications. Any help trying to figure this issue out would be appreciated!
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I have the same problem as well. I made a bug report for it upstream. Feel free to add extra information to it. https://github.com/linuxmint/Cinnamon/issues/1954
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The problem has been fixed in Cinnamon 1.8.2-2
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