GNU Philosophy seems to address this

Date: 2016-12-02 06:12 pm (UTC)
From: (Anonymous)

"Rules about packaging and distribution details

Rules about how to package a modified version are acceptable, if they don't substantively limit your freedom to release modified versions, or your freedom to make and use modified versions privately. Thus, it is acceptable for the license to require that you change the name of the modified version, remove a logo, or identify your modifications as yours. As long as these requirements are not so burdensome that they effectively hamper you from releasing your changes, they are acceptable; you're already making other changes to the program, so you won't have trouble making a few more."

So you take a copy of Ubuntu's ISO and to wrap things around it. You've modified the results from Canonical. So this block clearly applies. You're still free to distribute their binary packages unmodified.

I'd argue removing Canonical IP/trademarks is "so burdensome" as to "effectively hamper anyone from releasing your changes". Anyone with the interest in packaging a distro is going to require sufficient knowledge and skill to do so. They'll be plenty capable of doing the work requested by Canonical.
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Matthew Garrett

About Matthew

Power management, mobile and firmware developer on Linux. Security developer at Google. Ex-biologist. @mjg59 on Twitter. Content here should not be interpreted as the opinion of my employer.

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