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I use Ubuntu 9.10
I changed my password. After I restarted my machine and tried to do sudo whatever... I got

"username" is not in the sudoer list.

What should I do to get back in there?

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On Ubuntu, you need to be in the admin group. If you have left the admin group, then try booting to the recovery console:

  • when booting, hold down the shift key to bring up the grub menu
  • select the second option (which should say "recovery mode" or "recovery console" at the end of the line)
  • then add your user to the admin group again
# usermod -a -G admin your username
  • then reboot again and you should be able to do sudo stuff again.
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almost worked for me, I needed to regenrate the root password, as my user has no privileges on the group file. The rest of it, as you wrote. – Itay Moav -Malimovka May 24 '10 at 17:52

You have to check the /etc/sudoers file.

It is worth it to note that you will have to be root in order to read / edit the file. See visudo.

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:-) I can't access it, as I don't have sudo ... – Itay Moav -Malimovka May 24 '10 at 17:22

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