This seems to be not related to Qt 5.5, same message is seen with Qt 5.4.2 on xenial.
** Changed in: ubuntu-ui-toolkit (Ubuntu) Status: New => Invalid -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1450352 Title: Cannot create a Mouse on devices where X11 is not available Qt 5.5.0 Autopilot To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/ubuntu-ui-toolkit/+bug/1450352/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs