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I'm on Ubuntu 12.04 and using GNOME 3. This morning, after an update and a reboot, there was no longer a panel on the desktop. I have two monitors, if that makes any difference. I tried uninstalling any gnome-shell-extensions (I have gnome-shell-extension-prefs and gnome-shell-extension-tool) but it couldn't find any package by those names. I'm not even sure this is the reason that the panel is gone, it happened after an update.

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up vote 1 down vote accepted

I reinstalled the proprietary NVIDIA drivers and now everything works perfectly.

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As more than 2 days have passed, you can accept this answer now. (You have to wait 48 hours after posting your own answer to your own question, before accepting it.) I recommend doing this, as it will mark the question as answered and make clear that you're no longer seeking help. –  Eliah Kagan Sep 1 '12 at 17:06
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