Check out example codes for "requests python-passlib python-pil -y ubuntu 18.04". It will help you in understanding the concepts better.

Code Example 1

wget -O - https://nightly.odoo.com/odoo.key | apt-key add -
echo "deb http://nightly.odoo.com/12.0/nightly/deb/ ./" >> /etc/apt/sources.list
apt-get update

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