I've not had time to read the 65 posts above, but I've experienced this same problem.
I hope someone can fix it for all Ubuntu/Linux users. It seems weird that numlock sometimes moves the mouse instead of being a number pad. I've not knowingly pressed SHIFT and num lock at the same time neither have I changed the keyboard settings to affect this.
I've not had time to read the 65 posts above, but I've experienced this same problem.
I hope someone can fix it for all Ubuntu/Linux users. It seems weird that numlock sometimes moves the mouse instead of being a number pad. I've not knowingly pressed SHIFT and num lock at the same time neither have I changed the keyboard settings to affect this.