I neglected to mention and thought it was probably pretty important:
I walked through the installation process (automatic, because I am a newer Linux user) on my new 13.01 install of Unbuntu and this printer install for the Canon PixmaMX880 worked flawlessly.
Later the same day when I walked through the exact same process on my older install of 12.04 Ubuntu (it's probably 6 months old) it failed with the above error "no trusted origin".
I am unsure whether the age of the Ubuntu installation or the version of the Ubuntu installation is more impactful, or both.
I neglected to mention and thought it was probably pretty important:
I walked through the installation process (automatic, because I am a newer Linux user) on my new 13.01 install of Unbuntu and this printer install for the Canon PixmaMX880 worked flawlessly.
Later the same day when I walked through the exact same process on my older install of 12.04 Ubuntu (it's probably 6 months old) it failed with the above error "no trusted origin".
I am unsure whether the age of the Ubuntu installation or the version of the Ubuntu installation is more impactful, or both.