Install pgAdmin 4 on Debian/Ubuntu

Setup the repository

# Install the public key for the repository (if not done previously)

curl https://www.pgadmin.org/static/packages_pgadmin_org.pub | sudo apt-key add

# Create the repository configuration file:

sudo sh -c 'echo "deb https://ftp.postgresql.org/pub/pgadmin/pgadmin4/apt/$(lsb_release -cs) pgadmin4 main" > /etc/apt/sources.list.d/pgadmin4.list && apt update'

# Install pgAdmin

# Install for both desktop and web modes:

sudo apt install pgadmin4

# Install for desktop mode only:

sudo apt install pgadmin4-desktop

# Install for web mode only:

sudo apt install pgadmin4-web 

# Configure the webserver, if you installed pgadmin4-web:

sudo /usr/pgadmin4/bin/setup-web.sh

Reference:

https://www.pgadmin.org/download/pgadmin-4-apt/