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Ubuntu Software Center
Ubuntu has, for a long time, offered its own app store: The Ubuntu Software Center. This is a very handy feature and lets you find and install new programs without any real work.
Ubuntu's proprietary software
Many Linux users don't want to use proprietary software. But, if you're not a purist and you want to see Adobe Flash videos or listen to MP3s, then Ubuntu makes it easy to add that functionality with one click in the Ubuntu Software Center.
Keep all your apps in sync on multiple Ubuntu desktops
Do you ever get tired of having to install all your same old applications on every new desktop? I know I do. Ubuntu has an answer for that. You can set Ubuntu up so that all your apps automatically sync on all of your Ubuntu desktops. This can be quite handy.