This may be a stupid or trivial question, but I am new to Ubuntu, and have two unsolved problems (flashplayer doesn't play, and scanner doesn't work - in virgin install 13.04), so I started to search in documentation. In the 13.04 specific web site I was browsing the hardware section, and came across something like this: "Open Dash, and select Disk Utilities".
So what is Dash, and where is Disk Utilities?
The application finder could not find any of those. In terminal the "dash" command seems to invoke some sort of a shell.
The dash is what you might call Ubuntu's version of the start menu. You can invoke the dash by clicking on the dash icon on the Unity launcher:
or by pressing the Super key (The key with the Windows logo).
This is the dash:
Searching for "disk utilities" should bring up what you're looking for.
See also: What's the right terminology for Unity's UI elements?
For future reference, the Unity Dashboard was discontinued in 2017. If you're running a version of Ubuntu that still uses the Dash, it's time to upgrade.
Guide to the Ubuntu Unity Dash