Witold Baryluk, thank you for reporting this and helping make Ubuntu better.
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Status changed to 'Confirmed' because the bug affects multiple users.
** Changed in: gnome-panel (Ubuntu)
Status: New => Confirmed
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I was getting a similar problem:
(gnome-panel:2160): GLib-GObject-WARNING **:
/build/buildd/glib2.0-2.30.0/./gobject/gsignal.c:2295: signal
`size_request' is invalid for instance `0xcddac0'
I tried removing gnome-panels, and gnome-shell, however when you install
gnome-shell you get gnome-panel.
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https://bugs.launchpad.net/bugs/879164
Title:
gnome-panel crashes when trying to move panel
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