IMPORTANT!! I no longer recommend this method. See Unity Tweak Tool Issue.
The scrollbars in Ubuntu 14.04 are fine for most things, but they simply don’t work for me in Audacity. But luckily there is a way to remove the newer overlay scrollbars and replace them with the older scrollbars. Here’s how it’s done.
Open Terminal and copy and paste the following, then press enter and enter your password:
sudo apt-get remove overlay-scrollbar liboverlay-scrollbar-0.2-0 liboverlay-scrollbar3-0.2-0
That’s all there is to it.