What PL/pgSQL debugger can I use?
Here's an article I wrote for how to get one installed on Ubuntu.

Installation instructions for the pldebugger for PostgreSQL

pg_config --version
"9.3beta2"


Look here for source code matching your version of PostgreSQL:
ftp://ftp.postgresql.org/pub/source/

For me, it was:

wget ftp://ftp.postgresql.org/pub/source/v9.3beta2/postgresql-9.3beta2.tar.bz2
tar xvjf postgresql-9.3beta2.tar.bz2
cd postgresql
USE_PGXS=1 ./configure
USE_PGXS=1 make
cd contrib
git clone git://git.postgresql.org/git/pldebugger.git
make
cd pldebugger
USE_PGXS=1 make
sudo USE_PGXS=1 make install


These instructions assume that you have the development packages for your version of PostgreSQL already installed on your system.