Preview:
antes de todo instalar python3

Pasos principales:

Instalar la llave pública del repositorio:

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sudo curl https://www.pgadmin.org/static/packages_pgadmin_org.pub | sudo apt-key add -
Añadir el repositorio oficial a las fuentes:

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

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sudo apt install pgadmin4-desktop
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