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Code Block
languagebash
brew update
Error: The /usr/local directory is not writable.
Even if this directory was writable when you installed Homebrew, other
software may change permissions on this directory. For example, upgrading
to OS X El Capitan has been known to do this. Some versions of the
"InstantOn" component of Airfoil or running Cocktail cleanup/optimizations
are known to do this as well.


You should probably change the ownership and permissions of /usr/local
back to your user account.

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Code Block
sudo chown -R setup.admin /usr/local
chown: /usr/local: Operation not permitted

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