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I have been trying to setup a PXE server from terminal of another PXE server, at the very beginning I am trying to create repository, I keep on getting this error. sudo: /etc/sudoers is mode 0755, should be 0440

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Welcome to ask-ubuntu. Unfortunatelly the title of your question and most of the question has nothing to do with your actual problem. Which is that the permissions of /etc/sudoers should be 0440 (rw-rw----) instead of 0755 (rwxrwx---). Running chmod 0440 /etc/sudoers as root (or with sudo) should fix that problem. If you cannot run it as root or with sudo, please re-formulate your question accordingly. –  Adaephon Mar 24 '14 at 12:16

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