Not everyone hates Ubuntu's Unity, but there are a few things you might miss from Ubuntu's old interface -- like it's easy-to-navigate dropdown menu for applicatoins and settings. ClassicMenu Indicator puts that classic menu back in your menu bar.
ClassicMenu Indicator is simple: Just install it, start it up, and you'll see a new Ubuntu icon pop up in your menu bar, near your other indicator icons. Click on it to get the classic dropdown menu. For most situations, using the Dash is faster for launching an app, but if you aren't sure what you're looking for (or if you want to look through Ubuntu's settings), the dropdown menu is a much easier, more familiar way to browse. Of course, if you want to get rid of Unity entirely, there are ways to do that too.
ClassicMenu Indicator is a free download for Linux only.