I'm running Ubuntu 12.04. The overlay scrollbar doesn't appear in the dash when i hover over the scrollbar. It appears in other places.
It's a known bug/"feature" in Nux
I believe this is what you mean (see circled cursor):
This is a known bug/feature, with no estimated fix date (it's in the backlog).
The situation and bug report are very complicated because the bug was originally filed in 2010 when Unity was still 2D; that was fixed, but it's still a problem in the new Unity 3D interface.
- Overlay scrollbars work everywhere else because applications use GTK+; but not for the Dash because it uses Nux instead.
To expedite a fix, I recommend filing a new bug, explicitly linking to the old one and emphasizing that this is only for the new Unity 3D dash using Nux.
- Try to not even need scrolling by using the Filter to reduce the displayed results.
- Use the up/down arrow keys instead