@seb128 or somebody else: Is it possible to re-open this bug for Nautilus in Oneiric? :)
I'm proposing a new version of the patch made by Dmitry and reverted in the last version. It's not so different but instead of removing the menubar, menubar's widget is not created for the desktop nautilus window on non-ubuntu session.
I hope it's correct and this version (or something else) can be uploaded on Oneiric-update in order to (quickly? :) ) remove this annoying bar on non-Ubuntu sessions ;)
Please don't hesitate to test the new version and to confirm if it fixes this bug or not and it's also correct for the bug #912379!
This new version of Nautilus is currently building on my ppa:matttbe/ppa => https://launchpad.net/~matttbe/+archive/ppa/+sourcepub/2261799/+listing-archive-extra
sudo add-apt-repository -y ppa:matttbe/ppa
sudo apt-get update
sudo apt-get install nautilus nautilus-data libnautilus-extension1 gir1.2-nautilus-3.0
sudo add-apt-repository -r ppa:matttbe/ppa