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I did this once, but I can't find instructions how to do that again. It was probably kernel option that make live cd save in ram.

I have old Xubuntu but want to install nested version of Xubuntu, I've downloaded the iso on my old laptop but it have broken DVD, so how can I run live CD, of old Xubuntu, put it in RAM so I can put empty DVD and then burn new Xubuntu?

jcubic
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Found it in the ubuntu wiki page https://wiki.ubuntu.com/BootToRAM

Basically you need to edit kernel options from your liveCD while it's booting. While grub2 is loading, you should be able to use e and add option to the kernel toram.

jcubic
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