install pgadmin4

1. vim /etc/apt/sources.list.d/pgdg.list deb http://apt.postgresql.org/pub/repos/apt/ bionic-pgdg main
2. wget --quiet -O - https://www.postgresql.org/media/keys/ACCC4CF8.asc | sudo apt-key add - sudo apt-get updatesudo apt-get
3. install postgresql-10  pgadmin4