In the downloads page, you can contribute to Ubuntu by donating money. I recall someone saying that this money goes to for-profit Canonical to do as they please, and not to the not-for-profit Ubuntu Foundation. Can anyone find a source for this assertion?
I think you'll need to contact Canonical's legal staff for a full answer of how the money is managed and allocated in relation to Ubuntu, and to ask for that clarification to be included on the donation page of the site as well. However, given the dormancy of Ubuntu Foundation, one can infer that the money is handled by Canonical and is allocated to activities pertinent to Ubuntu.