How to fix homebrew permissions?

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I was able to solve the problem by using chown on the folder: 

sudo chown -R "$USER":admin /usr/local

Also you’ll (most probably) have to do the same on /Library/Caches/Homebrew:

sudo chown -R "$USER":admin /Library/Caches/Homebrew

Apparently I had used sudo before in a way that altered my folder permission on /usr/local,
from here on forward all installations with brew have proven to be successful.

This answer comes courtesy of gitHub’s homebrew issue tracker

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