And the only thing you can do is boot Linux off some other media, preferably a Live Linux CD.
你唯一能做的就是从其他媒介启动Linux，最好是Live CD。
Like Knoppix, it shunts boot options off to switches you can type at the boot: prompt in the few seconds before it launches into the default.
和Knoppix一样，它没有使用引导选项而是使用了开关，在它开始默认的引导之前几秒钟，您可以在boot：提示符中输入这些开关。
You simply upgrade one disk then boot off it, and when you need to go back to the other version, simply boot off that disk instead.
只需升级一个磁盘，然后从它引导；当需要返回到另一个版本时，只需从另一个磁盘引导。
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