The error is not still clear to me, but I got it working.
I discovered there was a submitted bug fot the file:
/packages/acs-bootstrap-installer/db-init-checks-postgresql.tcl
the one that launch the postgres error according to the log, so I went to the CVS and downloaded the file, and sites worked correctly.
I looked the file with the cvs web interface in this link:
http://dev.openacs.org:8000/cvs/
