PostgreSQL 12.5/ pgAdmin - postgis. Error: column p.proisagg does not exist

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 https://dba.stackexchange.com/questions/238903/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