1. create a file named run.sh
2. add this:

rm -rf /usr/local/bin/brew
rm -rf /usr/local/share/doc/homebrew
rm -rf /usr/local/share/man/man1/brew.1
rm -rf /usr/local/share/zsh/site-functions/_brew
rm -rf /usr/local/etc/bash_completion.d/brew
rm -rf /usr/local/Homebrew

3. run the file using sh run.sh

Or, just run all these commands manually one by one.

@ashdaily commands worked for me, addindg sudo on last command and then executing also the @Sinux command too:

rm -rf /usr/local/bin/brew
rm -rf /usr/local/share/doc/homebrew
rm -rf /usr/local/share/man/man1/brew.1
rm -rf /usr/local/share/zsh/site-functions/_brew
rm -rf /usr/local/etc/bash_completion.d/brew
sudo rm -rf /usr/local/Homebrew
rm -rf /opt/homebrew

Steps to fix it on Big Sur (2021):

1. git config --global user.email
2. Remove the cellar and homebrew directories from /usr/local
3. Re-try the installation

Works for me on Big Sur.

• New home-brew will installed in /opt/homebrew/ folder.
• If some errors happened at installation you need to reinstall all.
• Try to clean all trashes with sudo rm -rf /opt/homebrew/ command
• Tested and It's worked (12 September 2021)

Also, may you need to configure git config --global user.email

just do this little code rm -fr $(brew --repo homebrew/core) # because you can't brew untap homebrew/core brew tap homebrew/core

Fastest and easiest way is to uninstall Homebrew by following command -

/bin/bash -c "$(curl -fsSL )"

and after this, fresh install of Homebrew by following command -

/bin/bash -c "$(curl -fsSL )"

To fix the issue on Monterey:

1. sudo rm -rf /opt/homebrew/
2. git config --global user.email 

After executing the steps, try back the installation

On linux the default installation happens at /home/linuxbrew

Just delete the /home/linuxbrew: sudo rm -rf /home/linuxbrew

Make sure you disable any ISP related 'child safe' settings.

I've been pulling my hair out with this for the last few hours - turned out that it was my ISPs 'child safe' settings (recently switched to Virgin Media) Hope this helps someone who's tried all the above and still having problems.

Deleting /opt/homebrew directory worked for me.

I am using Macbook air M1

sudo rm -rf /usr/local/HomeBrew
sudo rm -rf /opt/homebrew/

// actuall command to install HomeBrew
/bin/bash -c "$(curl -fsSL )"

If it still doesn't work, try setting you email for git client

git config --global user.email 

If you're using M1 mac, probably homebrew packages were installed in /opt/.

Try deleting packages like this:

sudo rm -rf /opt/homebrew/bin/brew \
rm -rf /opt/homebrew/share/doc/homebrew \          
rm -rf /opt/homebrew/share/man/man1/brew.1 \
rm -rf /opt/homebrew/share/zsh/site-functions/_brew \
rm -rf /opt/homebrew/etc/bash_completion.d/brew \
rm -rf /opt/homebrew

worked for me. :)