Public bug reported:
Binary package hint: gnome-panel
After upgrading from Edgy, the volume applet dies unexpectedly upon
GNOME start-up.
No attempt to resolve problem has been made.
** Affects: gnome-panel (Ubuntu)
Importance: Undecided
Status: Unconfirmed
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Gnome Panel applets crashing
https://launchpad.net/bugs/80799