- Log in to a Gnome session on Wayland.
- Start Qt's online installer from the command line:
On the command line you can read:
- Cancel the installer.
- Do as the installer told you:
The installer exits immediately:
Because of issues like LP1958684 it seems to be a good decision to not use Wayland. The instruction to use QT_QPA_PLATFORM is just not helpful when the installer was built without the Wayland plugin, so it should not be shown.