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I'm new to Linux.
My current goal is to build my own LiveCD of Ubuntu. Small size, tiny gui, controlled by vnc and/or ssh.

My workspace is a 12.04 full installation in Virtual Box.

As the "base" I try to use a copy of the "Ubuntu Mini Remix" (tried 13.10 and 12.04).
For remastering I tried the ubuntu-builder, the uck and Customizer.
(uck and Customizer (could) work great).

My problems is, no matter what tool I use, it ends up failing every time with the same error. A screen filled with a lot of Authentication Failure messages. Even when I only feed the iso to one of the programs and immediately recreate the iso.

I found out, that it maybe it has something to do with the dynamically created default user called ubuntu, which the system uses as the user used to boot.
In the chroot environment I could not find the user in the passwd. I guess the generation process is defined in the casper.conf.

I tried modifying the casper.conf, but to no luck.

Why can't I just tell the system what user to use, when it boots?
Or why does the generating process of the default user called ubuntu break, if I touch the iso? (maybe it does work, but the authentication on boot dislikes the generated user.)

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