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I have tried sudo apt-get purge ubuntu-sdk qtcreator qtcreator-plugin-ubuntu qtcreator-plugin-cordovaqt and then sudo apt-get install ubuntu-sdk but QtCreator will still not start. It does not show up and after a few tries at starting it the apport gui shows up. I get this error when I run qtcreator in the terminal:

Cannot mix incompatible Qt library (version 0x50001) with this library (version 0x50002)
Aborted (core dumped)
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I found the bug on launchpad and fixed it with a sudo apt-get upgrade

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