IANAL, but I don't think that can happen. It seems to me that in the above scenario, the manufacturer would be in violation of the GPLv3. Assuming a relevant copyright holder stepped forward to enforce the terms, the manufacturer would have to cease distribution and could be forced to pay some sort of damages. But I doubt a court would be inclined or able to force Ubuntu to do anything, if Ubuntu wasn't the violator.
It sounds like a spin on the old "if I accidentally link my code to GPL code and distribute it, then the GPL will spread to my code", which of course is not the case.
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