[postgis-users] postgis Ubuntu

[Jon Saints]

I installed postgis on Ubuntu using the debian GIS
repository. I am not sure that this is possible, but I
thought that i would give it a try. Although postgis
installed without warnings, I now have trouble when I
try to spatialy enable a database.

The command: 
psql -d indon -f
/usr/share/postgresql/contrib/lwpostgis.sql


yeilds:
psql:/usr/share/postgresql/contrib/lwpostgis.sql:36:
ERROR:  could not load library
"/usr/lib/postgresql/lib/liblwgeom.so.1.0":
/usr/lib/postgresql/lib/liblwgeom.so.1.0: undefined
symbol: _ZN4geos11Polygonizer11getPolygonsEv

Any ideas?
thanks
Jon