“Ubuntu 14.04: default qtcreator cmake plugin is bugged, but you can easily install qtcreator 3.1.1 from this non-official repository [1] (Warning, it is using qt4 rather than qt5).”
I found this on the following web page in the second last section regarding QtCreator: https://www.sofa-framework.org/community/doc/getting-started/build/linux/