This is a weird mistake, maybe something is wrong with your dpkg. You can always try to create python from the source. This works in a regular finished Ubuntu, so it should work on Windows as well.
sudo apt-get install zlib1g-dev wget www.python.org/ftp/python/3.6.0/Python-3.6.0.tgz tar -xf Python-3.6.0 cd Python-3.6.0 ./configure
Save these commands in a file called python.sh, then run
chmod 755 python.sh ./python.sh
It may take some time, so be patient
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