必须是可安装的文件系统。

Must be an installable file system.

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软件包只包含可安装的映像；所有文档在文档包中。

The package contains only the installable image; all documentation is in the documentation package.

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接下来，将显示一个可安装的产品的列表(图12)。

Next, you are presented with a list of products that are available for installation (Figure 12).

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