pgAdminIII reports errors related with a column missing after installing postgis in postgres 12.5 and ubuntu 20.04
Error column proisagg does not exist where perhaps you meant pr.proisagg
people reported this error en previous versions and phpadmin
PostgreSQL 11 error: column p.proisagg does not exist
Solution there does not work
Note /usr/share/phpPgAdmin/classes/database/ does not exist in my installation