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I've changed / folder owner from root to administrator account. Now no sudo commands are working.

It used to show sudoers are in mode 04666 it should b in the mode 04000 Then i did something and it is showing "sudo:must be setuid root" help me out

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You'll have to change your permissions back to what they were. Many system programs have specific permissions requirements, and changing permissions outside of your home directory isn't a good idea unless you specifically know that it's safe to do.

If you changed a bunch of permissions and don't know their original values, you're looking at a reinstall. Fixing a large number of permissions would be really difficult to do correctly.

If you aren't able to use the chmod and chown commands due to your messed up permissions, boot into the live CD, mount your hard drive, and fix the permissions from there.

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I cant run any commands begins with sudo :( Do i have to reinstall ubuntu?? isn't there any other alternative ?? – bharath Sep 22 '12 at 18:43
No. Just use the LiveCD to access your filesystem and change the permissions. – January Sep 22 '12 at 19:06

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