Thanks for your bug report. The crash looks like a memory corruption.
Could you try to get a valgrind log for it? (you can follow the
instructions from https://wiki.ubuntu.com/Valgrind for that)
** Changed in: gnome-panel (Ubuntu)
Importance: Undecided => Medium
Assignee: (unassigned) => Ubuntu Desktop Bugs
Status: Unconfirmed => Needs Info
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[apport] gnome-panel crashed with SIGSEGV in xcb_xlib_unlock()"
https://launchpad.net/bugs/91384
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