各位好，
我的电脑是安装win10，最近想要多装个ubuntu。
上网爬过文，还是一直鬼打墙，希望经验丰富的板友们能够帮忙一下，谢谢！
首先，我在win10下，用电脑管理切割出一块磁盘区
http://i.imgur.com/CMoY1cy.jpg（图中198.28 GB那块）
用USB开机以后，进入到了ubuntu的安装画面，
遇到了这个问题：
http://i.imgur.com/lwWD5Sb.jpg
显示：
Force UEFI Installation?
This machine's firmware has started the installer in UEFI but it looks like
there may be existing operating systems already installed using "BIOS
compatibility mode" If you continue to install Debian in UEFI mode. it might
be difficult to reboot the machine into any BIOS mode operating systems later.
If you wish to install in UEFI mode and don't care about keeping the ability
to boot one of the existing systems, you have the option to force that here.
If you wish to keep the option to boot an existing operating system, you
should choose NOT to force UEFI installation here.
如果不管这个讯息，进到下个步骤：
http://i.imgur.com/VsneTqT.jpg
先前切割出来的空间，会显示“不可使用”，
如果选择安装在那个空间的话，
就会出现：
http://i.imgur.com/o19QSQp.jpg
不知道我是哪里出错了呢？？
在这里先感谢各位的帮忙！
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ps.windows的快速开启选项有关闭
http://i.imgur.com/q0nQiFy.jpg
另外附上BIOS的设定：
http://i.imgur.com/lI8U5M4.jpg
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