Which set of packages are you using?
I was using the 3.5.13 Ubuntu Oneiric packages initially (on Ubuntu Precise), I upgraded later to the R14 nightlies for Ubuntu Precise from here: http://ppa.quickbuild.pearsoncomputing.net/trinity/trinity-nightly-builds/ub... http://ppa.quickbuild.pearsoncomputing.net/trinity/trinity-nightly-build-dep...
The nightlies should include the migratekde3 script
Erm, I didn't update the Debian/Ubuntu packaging to include the migration scripts until yesterday. Rebuild is in progess! :-)
Tim