I have multiple eclipse SDKs installed on my linux notebook. They are in different directories and I do not remember which is the last one I installed. The command 'which eclipse' gets me /usr/bin/eclipse. /usr/bin/eclipse is a shell script that (among other things) sets ECLIPSE=/usr/lib/eclipse/eclipse.
The Debian maintainers have issued the fifth update to the current stable branch, Debian 5.0 “Lenny.” The updated release, Debian 5.0.5, fixes several security and stability issues and comes with up-to-date packages. Notable changes are the removal of the Eclipse IDE packages from the repositories and newer Linux kernel versions.