Hi
you can refer this thread:
I used these steps, and error got resolved for me:
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Open terminal
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Navigate to anaconda3
cd anaconda3
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update conda
conda update conda
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Navigate to conda env section and create new environment named fastai
cd envs
conda create --name fastai
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make fastai environment as current working directory
cd fastai
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clone github repository of course-v3
git clone https://github.com/fastai/course-v3.git
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make course-v3 as current working dir
cd course-v3
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open jupyter notebook
jupyter notebook
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Click New->Terminal in Jupyter, then type:
conda install -c fastai fastai
this step will install all required libraries.
after this you can update conda environment ( for me it was updated)