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I was running the other day an ubuntu cdlive and something drew my attention. I installed a few apps and they seemed to have been installed on the disk. What I wonder now is, where are these apps actually installed? I guess they can't have been installed on the DVD-R from which a ran ubuntu. Will the new apps be there the next time a run the livecd? If not, is there any possibility to save the changes made to the file system?

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No idea about live cd, but on Live USB you can have persistent software install. –  Lamb Nov 22 '12 at 18:03
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What I wonder now is, where are these apps actually installed?

They are installed to the virtual system in the ram. When you boot up a live CD, it copies most of the system files to ram (at least, thats how I understood it as).

Will the new apps be there the next time a run the livecd?

No, just like your files on the live system they will go into the virtual ether.

If not, is there any possibility to save the changes made to the file system?

I remember a tool in trisquel that did that..., you had to have two CD drives, or a place to save the .iso, though...

You could try this http://www.remastersys.com/

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some further reading: <lifehacker.com/5588211/…;, <en.wikipedia.org/wiki/RAM_disk>; and <en.wikipedia.org/wiki/Live_CD>; –  Gallefray Nov 22 '12 at 18:44
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