Install Odoo CRM on Ubuntu 20.04

Following are steps to install Odoo CRM on Ubuntu 20.04 from git source

apt -y update
apt -y upgrade
apt install git python3 python3-pip postgresql postgresql-client
cd /usr/src
git clone https://github.com/odoo/odoo.git
apt -y install python3-dev libxml2-dev libxslt1-dev libldap2-dev libsasl2-dev \
    libtiff5-dev libjpeg8-dev libopenjp2-7-dev zlib1g-dev libfreetype6-dev \
    liblcms2-dev libwebp-dev libharfbuzz-dev libfribidi-dev libxcb1-dev libpq-dev
cd /usr/src/odoo
pip3 install setuptools wheel
pip3 install -r requirements.txt

Start odoo in background and dis-attached

cd /usr/src/odoo
python3 odoo-bin & disown

Access GUI at http://server_ip:8069
At this point you are request to set database user and password and initiate new database.

Refer to this link for asterisk connector:
https://github.com/OCA/connector-telephony/tree/14.0/asterisk_click2dial