*** This bug is a duplicate of bug 128735 ***
https://bugs.launchpad.net/bugs/128735
** This bug has been marked a duplicate of bug 128735
Notification Area on second screen's panel doesn't work
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notification applet does not display system notification icons on
multi-screened display
It looks like this one is being tracked in bug #128735 and #12696. Not
that helps solve the problem, but since I'm also having the same problem
and was searching the database, I thought I'd put a note here pointing
at those other two.
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notification applet does not display system notification