Have been trying the development version for the past two months, and
have just upgraded to snapshot 1.9.20.

After this process i tried to install postgresql, but the upgrade
process failed with to following error message:

var/lib/postgresql/8.3/main is not accessible or does not exist.

And the same error message would result if I tried to remove (purge)
the package.

Creating the directory, made it possible to remove the package
(install stil not possible), and after having done a total removal of
the package, a fresh install succeeded.

Is there some way to configure postgresql so as to make a successful
upgrade possible, My thought is that if I move the data directories to
a location where the update script don't remove files a error free
upgrade should be possible. And your database would not need to be
configured.

Please comment