Using the recent Ubuntu distributions (up to 18.10.), after installation of Qt software, I could see and start the Qt-Creator in the application window. Now I have installed Ubuntu 19.10. and Qt 5.12.6 and there is no more Qt-Creator Button in the application window. Hence, I have the problem, that I don't know, how to start Qt-Creator. I am asking for a solution. The button should apper within the buttos below.
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