Back in Febrary, I wrote a longish article on how to upgrade PostgreSQL. That article is outdated. An upgrade can now take place with two lines:
pg_upgradecluster -v 8.3 8.2 main pg_dropcluster 8.2 main
The first copies the older version 8.2 files to the new 8.3 files directory. It does any modifications necessary. The second line then removes the old stuff.
