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Ok Update!

Setting the .desktop entry for Terminal from 'false' to 'true', now allows the QT Creator to be relaunched in a session.

The application still cannot be launched from the 'favorites' sidebar in Ubuntu 18.04.

However:

  • This has the annoying side effect of launching a terminal every time
  • It is contrary to the IDE instructions tutorial
  • It sill makes zero sense that the application can launch correctly once from a clean boot, but cannot relaunch successfully after that.

For those who might stumble on this issue, I am now able to use a desktop icon instead of the 'favorites' icon, and everything is acceptable. However I have not root caused the issue to my satisfaction. Consider this a workaround.

This workaround is also successful for .desktop entries for QT apps using ROS C++ libraries.