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前提条件：有另一台电脑（windows）来下载软件、制作启动优盘
再windows pc上：
1）下载ubuntu，从以下地址https://www.ubuntu.com/download/desktop
2）阅读安装说明，https://tutorials.ubuntu.com/tutorial/tutorial-create-a-usb-stick-on-windows#0
3）使用Rufus创建启动优盘，从以下地址下载Rufus: https://rufus.akeo.ie/
再准备安装Linux的电脑上：
1）使用上文介绍的启动优盘来引导系统启动
2）安装linux
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install ubuntu
(PreRequirment: you already have another windows PC)
on the windows pc:
1)down ubuntu from https://www.ubuntu.com/download/desktop
2)this installation guide: https://tutorials.ubuntu.com/tutorial/tutorial-create-a-usb-stick-on-windows#0
3)create a bootable USB flash disk include ubuntu image, using Rufus :https://rufus.akeo.ie/
on the empty linux comupter:
- boot the computer using the USB flash disk
- install linux