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I created groups and I cancled the administrator permissions [duplicate]

I am new to Ubuntu and to Unix/Linux system. I have Ubuntu 12.10. I created groups but without noticing, I cancelled my administrator permissions. Now I don't have admin/root user. What can I do? I ...
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What format is used in the LXC config file to specify control group settings?

I want to limit the CPU shares of available to two LXC containers running. It appears that this is done by adding the control group definitions into the LXC config file. But what's the format? The ...