title: PackagesNotFoundError: cudatoolkit=11.1.0 when installing pytorch
body: <p>I get the installation command from the <a href="https://pytorch.org/get-started/locally/" rel="noreferrer">https://pytorch.org/get-started/locally/</a>. When I run the command:
  <code>conda install pytorch torchvision torchaudio cudatoolkit=11.1.0 -c pytorch</code>
  I get the following error:</p>
  <pre><code>Collecting package metadata (current_repodata.json): done
  Solving environment: failed with initial frozen solve. Retrying with flexible solve.
  Collecting package metadata (repodata.json): done
  Solving environment: failed with initial frozen solve. Retrying with flexible solve.
  
  PackagesNotFoundError: The following packages are not available from current channels:
  
    - cudatoolkit=11.1.0
  
  Current channels: like
  
    - https://conda.anaconda.org/pytorch/linux-64
    - https://conda.anaconda.org/pytorch/noarch
    - https://repo.anaconda.com/pkgs/main/linux-64
    - https://repo.anaconda.com/pkgs/main/noarch
    - https://repo.anaconda.com/pkgs/r/linux-64
    - https://repo.anaconda.com/pkgs/r/noarch
  
  To search for alternate channels that may provide the conda package you're
  looking for, navigate to
  
      https://anaconda.org
  
  and use the search bar at the top of the page.
  </code></pre>
  <p>Then I have tried the following commands one by one:</p>
  <pre><code>(base) eslam@scholar:~$ conda config --append channels conda-forge
  </code></pre>
  <pre><code>(base) eslam@scholar:~$ install cudatoolkit=11.1.0
  install: missing destination file operand after 'cudatoolkit=11.1.0'
  Try 'install --help' for more information.
  </code></pre>
  <pre><code>(base) eslam@scholar:~$ conda install -c conda-forge cudatoolkit=11.1.0
  </code></pre>
  <p>Get the same output as above.</p>
  <pre><code>(base) eslam@scholar:~$ conda info --envs
  # conda environments:
  #
  base                  *  /home/eslam/anaconda3
  </code></pre>
  <p>How can I fix this problem, please?</p>