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Package python3.7 is not available, but is referred to by another package.

This may mean that the package is missing, has been obsoleted, or

is only available from another source

E: Package 'python3.7' has no installation candidate

E: Unable to locate package python-zbar

The command '/bin/sh -c set -ex; apt-get update; apt-get install -y ffmpeg wkhtmltopdf tesseract-ocr-ind libleptonica-dev python3.7 libtesseract-dev libwebp6 libwebp-dev libwebpdemux2 libwebpmux3 python-zbar wget unzip iputils-ping python3-pip webp iputils-ping jp2a' returned a non-zero code: 100