title: Error when installing brew on macos big sur
body: <p>I install brew following</p>
  <pre><code>/bin/bash -c &quot;$(curl -fsSL https://raw.githubusercontent.com/Homebrew/install/HEAD/install.sh)&quot;
  </code></pre>
  <p>but not working</p>
  <pre><code>==&gt; /usr/bin/sudo /bin/mkdir -p /usr/local/bin
  mkdir: /usr/local/bin: Not a directory
  Failed during: /usr/bin/sudo /bin/mkdir -p /usr/local/bin
  </code></pre>
  <p>Plzz help me. thanks</p>