I Will Do Installation Odoo14 On Ubuntu 20.04 LTS.

Odoo.sh

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1.- We create the odoo_install.sh file:
nano odooinstall.sh

2.- We add the following content:

#! / bin / bash
# We create the user and system group 'odoo':
sudo adduser --system --quiet --shell = / bin / bash --home = / opt / odoo --gecos ' odoo ' --group odoo
# Create a directory where the odoo configuration and log file will be stored:
sudo mkdir / etc / odoo && sudo mkdir / var / log / odoo /
# We install Postgres and base system libraries:
sudo apt update && sudo apt install postgresql postgresql-server-dev-12 build-essential python3-pil python3-lxml python3-ldap3 python3-dev python3-pip python3-setuptools nodejs git libldap2-dev libsasl2-dev libxml2-dev libxslt1-dev libjpeg-dev npm -y
# Download odoo version 14 from git:
sudo git clone --depth 1 --branch 14.0 https://github.com/odoo/odoo / opt / odoo / odoo
# sudo git clone --depth 1 --branch master https://github.com/odoo/odoo / opt / odoo / odoo
# We give permission to the directory that contains the OdooERP files and install the python3 dependencies:
sudo chown odoo: odoo / opt / odoo / -R && sudo chown odoo: odoo / var / log / odoo / -R &&  cd / opt / odoo / odoo && sudo pip3 install -r requirements.txt


3.- We give permission to the file:
sudo chmod u + x odooinstall.sh

4.- We execute :
sudo sh odooinstall.sh
5.- http: // localhost: 8069

good