The MAAS CLI is profile-based. You log in once with an API key and a profile name (for example, "admin").
sudo maas apikey --username=admin > ~/.maas-api
maas login admin http://127.0.0.1:5240/MAAS/api/2.0/ < ~/.maas-api
maas admin --help
A saved CLI session. Commands use the form maas PROFILE .... Here, admin is your profile.
maas admin maas set-config name=upstream_dns value="1.1.1.1,8.8.8.8"
Enable Ubuntu 24.04 ("noble") images for amd64, then import them.
maas admin boot-source-selections create 1 os="ubuntu" release="noble" arches="amd64" subarches="*" labels="*"
maas admin boot-resources import
MAAS can only deploy images you have selected and imported. Import now, so deploys do not fail later.
maas admin boot-resources read | jq -r '.[] | .name' should list your chosen releases.