title: How to downgrade CUDA to 10.0.10 with conda, without conflicts?
body: <p>I would like to go to CUDA (cudatoolkit) version compatible with
  <code>Nvidie-430</code> driver, i.e., <code>10.0.130</code> as recommended by the <a href="https://docs.nvidia.com/deploy/cuda-compatibility/index.html" rel="nofollow noreferrer">Nvidias site</a>.</p>
  <p>Based on <a href="https://stackoverflow.com/a/23974240/5986651">this answer</a> I did,</p>
  <p><code>conda install -c pytorch cudatoolkit=10.0.130</code></p>
  <p>And then I get <a href="https://pastebin.com/NG8hRY7N" rel="nofollow noreferrer">this error (pastebin
  link)</a>. (very-short version below):</p>
  <pre><code>(fastaiclean) eghx@eghx-nitro:~$ conda install -c pytorch cudatoolkit=10.0.130
  ...  
  Solving environment: failed with initial frozen solve. Retrying with flexible solve.
  Solving environment: | 
  Found conflicts! Looking for incompatible packages.
  This can take several minutes.  Press CTRL-C to abort.
  failed   
  UnsatisfiableError: The following specifications were found to be incompatible with each other:
  
  Output in format: Requested package -&gt; Available versions
  
  Package _libgcc_mutex conflicts for:
  pyzmq -&gt; libgcc-ng[version='&gt;=7.3.0'] -&gt; _libgcc_mutex=[build=main]
  libgcc-ng -&gt; _libgcc_mutex=[build=main]
  lcms2 -&gt; libgcc-ng[version='&gt;=7.3.0'] -&gt; _libgcc_mutex=[build=main]
  ...  
  The following specifications were found to be incompatible with your system:
  
    - feature:/linux-64::__cuda==10.1=0
    - feature:|@/linux-64::__cuda==10.1=0
  
  Your installed version is: 10.1
  
  </code></pre>
  <p>Why am I getting conflicts? Why does it say <code>10.1</code> when cuda toolkit
  is <code>10.2.89</code> (<code>conda list</code>)? how to handle conflicts? What can I do
  with this error? The conflicts are so huge, I don't know where to start.</p>
  <p><strong>Other</strong></p>
  <ul>
  <li><p>Nvidia driver <code>430</code></p>
  </li>
  <li><p>current cudatoolkit: 10.2.89</p>
  </li>
  </ul>