Erm, I didn't update the Debian/Ubuntu packaging to include the migration scripts until yesterday. Rebuild is in progess! :-)
Okay. :-) I'm confused why that was necessary, but I don't use Debian. The cmake configuration should automatically build and install the migratekde3 script.
Debian/Ubuntu packaging usually specifies a list of files to install in each binary package. As the migration scripts were not added to those file lists, they were not installed.
Does your Debian/Ubuntu startup script that controls the graphical login look for kdm or tdm?
tdm IIRC.
Tim