I think about one thing,

try to create a new user on your system, to have a clean home directory.
Log in this new session and launch kdenlive to see if it works ...

if it does work you have a configuration problem on your first session
if it does not there is a kubuntu specific problem to identify

-- 
kdenlive crashes with SIGSEV 11 upon starting
https://bugs.launchpad.net/bugs/363265
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