SUDO

If you get the message:

sudo: can't open /etc/sudoers: Permission denied

Then check the following:

• Are the sudo permissions correct: /usr/bin/sudo should have 4111 (---s--x--x root root)
  
• Are the sudoers permissions correct: /etc/sudoers should have 0440 (-r--r----- root root)
  
• And the not-so-well-documented: The directory containing sudoers (usually /etc) must be readable by the group that owns this directory (not just the user!!)

Note that

make install

ensures that the file permissions are correct, but it does not check the /etc-permissions.

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