Hey MAAStronauts,
A known bug prevents the deployment of Ubuntu versions newer than Bionic when the machine uses a bonded network interface to communicate with the MAAS rack or region controller.
For reference, here’s the bug Bug #2106671 “Deployments using a bonded interface on the “MAAS”...” : Bugs : MAAS . The fix is ongoing and will be available in the next images published in images.maas.io.