Well, I just upgraded my Linux machines to Ubuntu 14.04, and now KDS no longer works.
I suspect it is due to the fact that 14.04 no longer has the ia32-libs package. This package did exist for Ubuntu 12.04, and KDS did work identically to the Windows version, for me.
After changing/adding a lot of 32b packages, I did manage to get eclipse to run in 14.04, but the graphics looked terrible. I also tried converting the 64b RPM to a DEB file, but the results were the same.
At this point, I am reverting back to Erich's generic Kepler implementation from mcuoneclipse.com.
I will come back to KDS once we have a 64b version with Linux debugging.