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First of all check that you sourced in your current terminal Conda (so that you can use conda)

Therefor a line like this one should be contained in your bashrc and be uncommented:

export PATH="/home/markus/anaconda3/bin:$PATH"

Next type:

conda remove libpng

Then comment in your bashrc this line:

export PATH="/home/markus/anaconda3/bin:$PATH"

Open a new terminal (STR+ALT+T) and try to cakin build your code again. This helped in my case

However if it does not you can try other options like :

cd /usr/lib/x86_64-linux-gnu
sudo ln -s ~/anaconda/lib/libpng16.so.16 libpng16.so.16
sudo ldconfig

But they did not help me ....