How do I disable overlay scrollbars?

In 12.04 LTS there's a slightly cleaner way to do it. Just run

gsettings set org.gnome.desktop.interface ubuntu-overlay-scrollbars false

in a terminal. Apps opened afterwards will have the non-ayatana scrollbar.

To get the default behavior back, run

gsettings reset org.gnome.desktop.interface ubuntu-overlay-scrollbars

If you are using 12.10 or later, run

gsettings set com.canonical.desktop.interface scrollbar-mode normal

And to return to the default, run

gsettings reset com.canonical.desktop.interface scrollbar-mode

You can disable the scrollbars either

For your user:

Add the line
```
  export LIBOVERLAY_SCROLLBAR=0
```
to the file ~/.xprofile (create one, if it doesn't exist).
Or globally:

Create a file /etc/X11/Xsession.d/99disable-overlay-scrollbars and add above line (requires root permissions, see this answer about how to create a file as root).
Or per application:
- Is there a way to blacklist an individual application from using overlay-scrollbars?

You can remove the scrollbars completely by typing

sudo apt-get remove overlay-scrollbar liboverlay-scrollbar

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