title: FileNotFoundError: [Errno 2] No such file or directory: 'update' when I run conda my Windows 10 laptop
body: <p>The Anaconda navigator and Jupyter Notebook were all working properly for me until I downloaded Tensorflow via the navigator. TensorFlow was successfully installed and I was able to import it in my Jupyter Notebook with no issues. 
  However, I closed the command prompt and typed <code>jupyter notebook</code> in the command prompt and got this output:</p>
  
  <pre><code>Traceback (most recent call last):
    File "c:\users\abdullah siddiqui\anaconda3\envs\tensorflow\lib\runpy.py", line 193, in _run_module_as_main
      "__main__", mod_spec)
    File "c:\users\abdullah siddiqui\anaconda3\envs\tensorflow\lib\runpy.py", line 85, in _run_code
      exec(code, run_globals)
    File "C:\Users\Abdullah Siddiqui\Anaconda3\Scripts\jupyter.exe\__main__.py", line 9, in &lt;module&gt;
    File "c:\users\abdullah siddiqui\anaconda3\envs\tensorflow\lib\site-packages\markdown\__main__.py", line 130, in run
      markdown.markdownFromFile(**options)
    File "c:\users\abdullah siddiqui\anaconda3\envs\tensorflow\lib\site-packages\markdown\__init__.py", line 529, in markdownFromFile
      kwargs.get('encoding', None))
    File "c:\users\abdullah siddiqui\anaconda3\envs\tensorflow\lib\site-packages\markdown\__init__.py", line 428, in convertFile
      input_file = codecs.open(input, mode="r", encoding=encoding)
    File "c:\users\abdullah siddiqui\anaconda3\envs\tensorflow\lib\codecs.py", line 895, in open
      file = builtins.open(filename, mode, buffering)
  FileNotFoundError: [Errno 2] No such file or directory: 'notebook'
  </code></pre>
  
  <p>This was quite puzzling because I never had this issue before. I then tried to open the Anaconda Navigator and got this output:</p>
  
  <p><a href="https://i.stack.imgur.com/EVlSK.jpg" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/EVlSK.jpg" alt="enter image description here"></a></p>
  
  <p><a href="https://github.com/ContinuumIO/anaconda-issues/issues/2668" rel="nofollow noreferrer">This github link</a>  suggested running the command <code>conda update anaconda-navigator</code>. I ran this command on my command prompt and even this produced an error.</p>
  
  <pre><code>C:\Users\Abdullah Siddiqui&gt;conda update anaconda-navigator
  Traceback (most recent call last):
    File "c:\users\abdullah siddiqui\anaconda3\envs\tensorflow\lib\runpy.py", line 193, in _run_module_as_main
      "__main__", mod_spec)
    File "c:\users\abdullah siddiqui\anaconda3\envs\tensorflow\lib\runpy.py", line 85, in _run_code
      exec(code, run_globals)
    File "C:\Users\Abdullah Siddiqui\Anaconda3\Scripts\conda.exe\__main__.py", line 9, in &lt;module&gt;
    File "c:\users\abdullah siddiqui\anaconda3\envs\tensorflow\lib\site-packages\markdown\__main__.py", line 130, in run
      markdown.markdownFromFile(**options)
    File "c:\users\abdullah siddiqui\anaconda3\envs\tensorflow\lib\site-packages\markdown\__init__.py", line 529, in markdownFromFile
      kwargs.get('encoding', None))
    File "c:\users\abdullah siddiqui\anaconda3\envs\tensorflow\lib\site-packages\markdown\__init__.py", line 428, in convertFile
      input_file = codecs.open(input, mode="r", encoding=encoding)
    File "c:\users\abdullah siddiqui\anaconda3\envs\tensorflow\lib\codecs.py", line 895, in open
      file = builtins.open(filename, mode, buffering)
  FileNotFoundError: [Errno 2] No such file or directory: 'update'
  </code></pre>
  
  <p>Running the command from Anaconda Prompt also gave me the same response. I am getting the same responses for other commands such as list.</p>
  
  <p>I can find the version of conda from my command line.</p>
  
  <pre><code>C:\Users\Abdullah Siddiqui&gt;conda --version
  conda 2.6.11
  </code></pre>
  
  <p>I can even run python from my command line. </p>
  
  <pre><code>C:\Users\Abdullah Siddiqui&gt;python
  Python 3.5.5 | packaged by conda-forge | (default, Jul 24 2018, 01:52:17) [MSC v.1900 64 bit (AMD64)] on win32
  Type "help", "copyright", "credits" or "license" for more information.
  </code></pre>
  
  <p>I don't understand what exactly happened to conda immediately after downloading Tensorflow. By the way, now I can't even import tensorflow in my python environment.</p>
  
  <p>How can I get back to using conda and its facilities along with tensorflow?</p>
  
  <p><strong>EDIT:</strong></p>
  
  <p>Is my only option now to uninstall and reinstall Anaconda?</p>
  
  <p><strong>EDIT:</strong></p>
  
  <p>Even the website continuum.io is not working.</p>
  
  <p><a href="https://i.stack.imgur.com/RJMiP.jpg" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/RJMiP.jpg" alt="enter image description here"></a></p>