Install postgis-gui by entering the following commands in the terminal:
sudo apt update sudo apt install postgis-gui
Description:
Geographic objects support for PostgreSQL -- GUI programs
PostGIS adds support for geographic objects to the PostgreSQL object-relational database. In effect, PostGIS "spatially enables" the PostgreSQL server, allowing it to be used as a backend spatial database for geographic information systems (GIS), much like ESRI's SDE or Oracle's Spatial extension. PostGIS follows the OpenGIS "Simple Features Specification for SQL". . This package contains the PostGIS graphical shape file loader, shp2pgsql-gui.
Homepage: http://postgis.net/
Version: 2.4.3+dfsg-4
Section: universe/misc