On Ubuntu, running one of our product's installers in GUI mode with elevated privileges (using sudo alone) may result in the following warning in the terminal:
(Setup:5130): IBUS-WARNING **: The owner of /home/xyz/.config/ibus/bus is not root!
This is considered intentional, according to ibus package maintainer's for Ubuntu (see here). The fix for this is to either run the installer with sudo -i or gksudo.
sudo -i ~/Downloads/ThingSpan-15.0.1-linux86_64.run
Hope that helps!