Postgresql: Can't access to file « $libdir/postgis-2.1 » no such file or directory

Question

I guess this is a known issue but since I have used a script that removed my postgresql-9.4-postgis-2.1, I\'m now unable to get rid of this SQL error under Debian.

Answer 1

First run (as postgres administrator)

ALTER EXTENSION postgis UPDATE;

If this returns successfully, then check what version you have

SELECT PostGIS_Full_Version();

If however, the server returns that it cannot find the extension postgis, then run

CREATE EXTENSION postgis;
CREATE EXTENSION postgis_topology;
ALTER EXTENSION postgis UPDATE;

and again check by running

SELECT PostGIS_Full_Version();