How to restore the normal scroll bars in Ubuntu 11?
Simply create a file named /etc/X11/Xsession.d/80overlayscrollbars and put into it the following line:
or simply execute the following command
echo "export LIBOVERLAY_SCROLLBAR=0" > /etc/X11/Xsession.d/80overlayscrollbars
You need to do the above as root. This fix also resolve the Eclipse scroll bars issues.