Java Desktop System Release 3 supports Install Update
from the following previous releases:
Java Desktop System Release 2003
Java Desktop System Release 2
If you are upgrading from Java Desktop System Release 2003 or Release 2 to Java Desktop System Release 3, you must follow the instructions in the section “Update an Existing System” in Chapter 2 of the Java Desktop System Release 3 Installation Guide.
You must also reinstall any kernel modules that were installed on earlier releases after you upgrade to Java Desktop System Release 3.