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Possible Duplicate:
How do I reset a lost administrative password?
How can I give admin permissions to my account?

I have no root password and I accidentally removed the sudo privileges of the only account left.

Any suggestions?

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Please, edit your question adding more details like, What accounts do you have and What privileges they have, etc. –  Lucio Feb 4 '13 at 16:38
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marked as duplicate by Eliah Kagan, belacqua, bodhi.zazen, Takkat, gertvdijk Feb 6 '13 at 1:14

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2 Answers

  1. Boot into the recovery mode.

  2. Select Drop to root shell prompt.

  3. Add yourself to the sudo (for Ubuntu 12.04 onwards) or admin group (from Ubuntu 11.10 downwards):

     adduser username sudo
    

    or

     adduser username admin
    

    Of course, replace username with your actual user name.

  4. Reboot the computer using your preferred method. Typing Ctrl+Alt+Canc or using reboot are two of the many available methods.

NOTE: This procedure assumes that you have removed yourself from the sudo/admin group, which is not obvious. If instead you have edited /etc/sudoers or have changed some other configuration, please tell us what you have modified and how.

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Boot a live CD. Mount your root partition containing /etc. Modify the mounted /etc/group file to have your user back in the sudo group. Umount and reboot.

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I assume it's self explanatory correct? –  Steve Metzler Feb 4 '13 at 16:24
    
@SteveMetzler See my edit –  Paul van Schayck Feb 4 '13 at 16:34
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