title: /usr/bin/env: ‘python’: Permission denied---Problem while installing Ninja
body: <p>I am install Ninja on Ubuntu (which is running based on windows).</p>
  <p>I'm following the following steps:</p>
  <pre><code>apt-get install re2c
  git clone https://github.com/ninja-build/ninja.git
  
  cd ninja
  ./configure.py --bootstrap 
  cp ./ninja  /usr/bin
  </code></pre>
  <p>But there is a problem after type the command at <code>./configure.py --bootstrap </code> that I cannot solve:</p>
  <pre><code>/usr/bin/env: ‘python’: Permission denied
  </code></pre>
  <p>I am in root user, and the python 3 is installed.</p>
  <p>The permission list:</p>
  <pre><code>ls -ld configure.py # see the permission
  
  -rwxrwxrwx 1 # the listed permission
  </code></pre>
  <p>Has anyone seen this problem?</p>