Can’t answer the ubuntu-part (yet), but moto is decent minimal google, but still google. I have one I use for banking and depot-apps. It’s not bloated with stupid shit to the brim, like Samsung or poco or whichever else nowadays. Just some minor annoyances.

Yet I would prefer a used pixel just for graphene. As shitty as it might be to buy google, they’re still the best (easiest!) to modify.