I just installed GNOME Shell on my 12.04 a couple hours ago.

The notifications are just cool, and I installed shell extensions, and it works smoothly in 1 hour.

Then I restarted my computer for some reason, start back in to GNOME.

And I was surprised with the default notification showed up.

It replaced the GNOME notifications!

I tried to:

1. Reinstall gnome-shell. ^{(autoremove and install)}


2. Reset desktop configuration.

But it didn't work at all.

Is there anything I can do to fix it?

Plus: I got a double notification (osd + gnome notification showed up) when someone chatted me.