Unable to use sudo privileges in terminal

This line is the problem:

# See sudoers(5) for more information on "#include" directives:#includedir /etc/sudoers.d

The #includedir statement needs to be on it’s own line:

#includedir /etc/sudoers.d

It’s a “special” comment that actually means read all files under /etc/sudoers.d. Without it the /etc/sudoers.d/jupyterhub-admins file is ignored.

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