Package: postgis Version: 2.5.1+dfsg-1 The PostGIS extension for postgresql has apparently been moved out of the PostGIS package. One must now install postgresql-11-postgis-2.5 and postgresql-11-postgis-2.5-scripts to get the needed functionality.
These packages are only Recommends though, so someone upgrading from stretch with postgis package to buster will not actually get the postgis extension, causing the pg_upgradecluster to fail spectacularly. It seems like postgis should depend on both postgresql-11-postgis-2.5 and postgresql-11-postgis-2.5-scripts.
