Upgrading from 1.9: Follow the upgrade notifications in Gnome. There's no need to download the 2.0 CD.
============= Deltad
is no longer supported, and is not getting security updates. If you
still want to use deltad for some reason, you should change your
sources.list to point to http://archive.gnewsense.org/gnewsense-deltad/. Note that this is not recommended.
There is currently no upgrade path from deltad to deltah. If you want to switch, a reinstall will be required.
=============