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I was working on my machine. I did some Clamav Virus definition updates, ran clamav and everything worked fine using sudo.

Suddenly afterwards though, my machine started saying that

sudo: no valid sudoers sources found, quitting

What in the world is going on?

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Which Ubuntu version? (in case relevant) – david6 Dec 11 '11 at 21:14

I cannot explain why it happened, but I can propose how to solve.

Check if the file /etc/sudoers still exists.

If the answer is no, download the sudo package with

apt-get download sudo

then start in recovery mode, choose to run a root shell from the menu that BusyBox shows, and from command line run

mv /home/ray/sudo*.deb /var/apt/cache/archives/
apt-get purge sudo
apt-get install sudo

where I assumed /home/ray is your home directory.

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