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Ubuntu is completely free to download, use and share
To download and install Ubuntu, all you need is a blank CD or USB stick. You can replace your current operating system, whether it’s Windows or Mac OS, or run Ubuntu alongside it.
Looking for an easy way to install on Windows? Check out the Windows installer
Whether you want to configure a simple file server or build a fifty thousand-node cloud, you can rely on Ubuntu Server and its five years of guaranteed free upgrades.
Ubuntu Cloud comprises installation options for the OpenStack-based Ubuntu Cloud Infrastructure and Ubuntu Cloud Guest, all from within Ubuntu Server (included in this download).
Do you want to upgrade? Follow our simple guide
下载并安装Ubuntu桌面操作系统,你只需要一张空白的光盘或U盘。无论您当前的操作系统是 Windows 或 Mac OS,您都可以用 Ubuntu 取代它们,亦可以选择让 Ubuntu 与它们并存。