i did something stupid with sudo!!

hi, i was trying to turn off the password needed to log in to my account in ubuntu, and i was looking on the internet for ways to do that. i read an article which was about turning off passwords. It suggested the following:

1. Open the terminal window from Applications --> accessories --> terminal, run the command:

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sudo visudo

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2. Find the line that says

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%admin ALL=(ALL) ALL

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3. and change it to

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%admin ALL=(ALL) NOPASSWD: ALL

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4. Save and exit the file.

After doing it i got the error message:

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>>> /etc/sudoers: syntax error near line 25 <<<
sudo: parse error in /etc/sudoers near line 25
sudo: no valid sudoers sources found, quitting

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my password hasn't been turned off, and now i can't use sudo in the terminal. i can't figure it out at all and i dont know how to access that file again to change it back.

Weird. The point of using visudo is that it should prevent you from saving with syntax errors.

You should be able to boot into recovery mode and fix the file.
Fix Broken Sudo

Theres also the possibility to log in as root and change the line back.

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Originally Posted by zombykillah

Theres also the possibility to log in as root and change the line back.

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Ubuntu has the true root account disabled by default.

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Originally Posted by reed9

You should be able to boot into recovery mode and fix the file.

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I followed the link and tried as you suggested, but in recovery mode as well i get the same message.

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>>> /etc/sudoers: syntax error near line 25 <<<
sudo: parse error in /etc/sudoers near line 25
sudo: no valid sudoers sources found, quitting

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Do you have the live CD or live USB avaiable?

You should be able to boot into the live CD, mount your root partition, find the file, and fix it or copy the default from the live CD.

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Originally Posted by reed9

You should be able to boot into the live CD, mount your root partition, find the file, and fix it or copy the default from the live CD.

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I have the live CD, but i'm not sure how to mount my root partition. is it command line based, or gui?