I deleted all the default kits from Qt Creator and I don't know how to get them back. In other words, how can I restore all the default kits in Qt Creator?
I tried to delete all the Qt files from my Ubuntu System, the whole Qt folder, the ~/.config/QtProject folder and all qt packages. After reinstalling Qt, all the old kits are still there, instead of the default ones.
Delete the ~/.config/QtProject and ~/.local/share/data/QtProject/qtcreator directories:
rm -rf ~/.config/QtProject ~/.local/share/data/QtProject/qtcreator