I'm using Ubuntu 14.04 (64-bit) and I've installed the KDS v.3.2.0 successfully. However, when I try to download an example firmware to my FRDM-KW41Z the GDB session fails. Unfortunately I cannot tell you what the error message was (something about wrong target name). I solved this problem by updating the SEGGER driver just like it is described in this link:
(I had to make a symbolic link JLinkGDBServerCL -> JLinkGDBServer also)
and now everything works fine.
Hope this helps somebody,