title: conda python 3.7 opencv import error libgnutls.so.30: undefined symbol: mpn_add_1, version HOGWEED_4
body: <p>I am facing problem while getting opencv to work with python 3.7 in Conda on Ubuntu 20.04.</p>
  <p>I get the following error when I try to import cv2 in python:</p>
  <pre><code>$ python
  Python 3.7.8 | packaged by conda-forge | (default, Jul 23 2020, 03:54:19) 
  [GCC 7.5.0] on linux
  Type &quot;help&quot;, &quot;copyright&quot;, &quot;credits&quot; or &quot;license&quot; for more information.
  &gt;&gt;&gt; import cv2
  Traceback (most recent call last):
    File &quot;&lt;stdin&gt;&quot;, line 1, in &lt;module&gt;
  ImportError: /home/swagat/anaconda3/envs/tf2py37/lib/python3.7/site-packages/../../././libgnutls.so.30: undefined symbol: mpn_add_1, version HOGWEED_4
  
  </code></pre>
  <p>my Conda configuration looks something like this:</p>
  <pre><code>
  active environment : tf2py37
      active env location : /home/swagat/anaconda3/envs/tf2py37
              shell level : 2
         user config file : /home/swagat/.condarc
   populated config files : 
            conda version : 4.8.5
      conda-build version : 3.18.9
           python version : 3.7.4.final.0
         virtual packages : __cuda=10.1
                            __glibc=2.31
  </code></pre>
  <p>I installed opencv from the conda-forge channel using the following command:
  <code>$ conda install -c conda-forge opencv</code></p>
  <p>I can see that opencv is installed on my system:</p>
  <pre><code>$ conda list opencv
  # packages in environment at /home/swagat/anaconda3/envs/tf2py37:
  #
  # Name                    Version                   Build  Channel
  libopencv                 4.5.0                    py37_2    conda-forge
  opencv                    4.5.0                    py37_2    conda-forge
  py-opencv                 4.5.0            py37hc6149b9_2    conda-forge
  </code></pre>
  <p>I also checked if gnutls is installed:</p>
  <pre><code>$ conda list gnutls
  # packages in environment at /home/swagat/anaconda3/envs/tf2py37:
  #
  # Name                    Version                   Build  Channel
  gnutls                    3.6.13               h79a8f9a_0    conda-forge
  </code></pre>
  <p>What else I can try to solve this problem? I am kind of stuck here. Any help will be appreciated. Thanks.</p>