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This is not much help but here is what I can tell:
I have a script that runs ebook-convert everyday on my 12.04 system, so I know it can work on Ubuntu.
"locate libcalibre-launcher.so" says it is located in /opt/calibre/lib/libcalibre-launcher.so
ebook-convert --version says it is calibre 0.8.59.
I would check to make sure that libcalibre-launcher.so is there and maybe check the permissions of the file (and the directories getting to it) to make sure you can access it.
Also, maybe it you don't have the newest verison, try upgrading calibre.
If you can think of anything else I can look at on my system for you let me know.
Good luck!
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