Same problem, this is network connection notification.
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https://bugs.launchpad.net/bugs/1473269
Title:
Wily login screen shows an all black notification bubble
To manage notifications
Public bug reported:
Binary package hint: firestarter
bug in the line 112-121 lines of firestarter.sh.
problem on initializing the server
** Affects: firestarter (Ubuntu)
Importance: Undecided
Status: New
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cannot start DHCP server automatically
https://bugs.launchpad.net/bugs/