bladernr@critical-maas:~$ maas admin boot-resources read
Success.
Machine-readable output follows:
[
    {
        "id": 62,
        "type": "Synced",
        "resource_uri": "/MAAS/api/2.0/boot-resources/62/",
        "name": "centos/centos66",
        "subarches": "generic",
        "architecture": "amd64/generic"
    },
    {
        "id": 61,
        "type": "Synced",
        "resource_uri": "/MAAS/api/2.0/boot-resources/61/",
        "name": "centos/centos70",
        "subarches": "generic",
        "architecture": "amd64/generic"
    },
    {
        "id": 64,
        "resource_uri": "/MAAS/api/2.0/boot-resources/64/",
        "name": "grub-efi-signed/uefi",
        "type": "Synced",
        "architecture": "amd64/generic"
    },
    {
        "id": 65,
        "resource_uri": "/MAAS/api/2.0/boot-resources/65/",
        "name": "grub-efi/uefi",
        "type": "Synced",
        "architecture": "arm64/generic"
    },
    {
        "id": 66,
        "resource_uri": "/MAAS/api/2.0/boot-resources/66/",
        "name": "grub-ieee1275/open-firmware",
        "type": "Synced",
        "architecture": "ppc64el/generic"
    },
    {
        "id": 63,
        "resource_uri": "/MAAS/api/2.0/boot-resources/63/",
        "name": "pxelinux/pxe",
        "type": "Synced",
        "architecture": "i386/generic"
    },
    {
        "id": 35,
        "type": "Synced",
        "resource_uri": "/MAAS/api/2.0/boot-resources/35/",
        "name": "ubuntu/trusty",
        "subarches": "generic,hwe-p,hwe-q,hwe-r,hwe-s,hwe-t",
        "architecture": "amd64/hwe-t"
    },
    {
        "id": 32,
        "type": "Synced",
        "resource_uri": "/MAAS/api/2.0/boot-resources/32/",
        "name": "ubuntu/trusty",
        "subarches": "generic,hwe-p,hwe-q,hwe-r,hwe-s,hwe-t,hwe-u",
        "architecture": "amd64/hwe-u"
    },
    {
        "id": 33,
        "type": "Synced",
        "resource_uri": "/MAAS/api/2.0/boot-resources/33/",
        "name": "ubuntu/trusty",
        "subarches": "generic,hwe-p,hwe-q,hwe-r,hwe-s,hwe-t,hwe-u,hwe-v",
        "architecture": "amd64/hwe-v"
    },
    {
        "id": 34,
        "type": "Synced",
        "resource_uri": "/MAAS/api/2.0/boot-resources/34/",
        "name": "ubuntu/trusty",
        "subarches": "generic,hwe-p,hwe-q,hwe-r,hwe-s,hwe-t,hwe-u,hwe-v,hwe-w",
        "architecture": "amd64/hwe-w"
    },
    {
        "id": 31,
        "type": "Synced",
        "resource_uri": "/MAAS/api/2.0/boot-resources/31/",
        "name": "ubuntu/trusty",
        "subarches": "generic,hwe-p,hwe-q,hwe-r,hwe-s,hwe-t,hwe-u,hwe-v,hwe-w,hwe-x",
        "architecture": "amd64/hwe-x"
    },
    {
        "id": 36,
        "type": "Synced",
        "resource_uri": "/MAAS/api/2.0/boot-resources/36/",
        "name": "ubuntu/trusty",
        "subarches": "generic,hwe-p,hwe-q,hwe-r,hwe-s,hwe-t,hwe-u,hwe-v,hwe-w,hwe-x",
        "architecture": "amd64/hwe-x-lowlatency"
    },
    {
        "id": 8,
        "type": "Synced",
        "resource_uri": "/MAAS/api/2.0/boot-resources/8/",
        "name": "ubuntu/xenial",
        "subarches": "generic,hwe-p,hwe-q,hwe-r,hwe-s,hwe-t,hwe-u,hwe-v,hwe-w,ga-16.04",
        "architecture": "amd64/ga-16.04"
    },
    {
        "id": 5,
        "type": "Synced",
        "resource_uri": "/MAAS/api/2.0/boot-resources/5/",
        "name": "ubuntu/xenial",
        "subarches": "generic,hwe-p,hwe-q,hwe-r,hwe-s,hwe-t,hwe-u,hwe-v,hwe-w,ga-16.04",
        "architecture": "amd64/ga-16.04-lowlatency"
    },
    {
        "id": 7,
        "type": "Synced",
        "resource_uri": "/MAAS/api/2.0/boot-resources/7/",
        "name": "ubuntu/xenial",
        "subarches": "generic,hwe-p,hwe-q,hwe-r,hwe-s,hwe-t,hwe-u,hwe-v,hwe-w,ga-16.04",
        "architecture": "amd64/hwe-16.04"
    },
    {
        "id": 68,
        "type": "Synced",
        "resource_uri": "/MAAS/api/2.0/boot-resources/68/",
        "name": "ubuntu/xenial",
        "subarches": "generic,hwe-p,hwe-q,hwe-r,hwe-s,hwe-t,hwe-u,hwe-v,hwe-w,ga-16.04,hwe-16.04,hwe-16.10",
        "architecture": "amd64/hwe-16.04-edge"
    },
    {
        "id": 6,
        "type": "Synced",
        "resource_uri": "/MAAS/api/2.0/boot-resources/6/",
        "name": "ubuntu/xenial",
        "subarches": "generic,hwe-p,hwe-q,hwe-r,hwe-s,hwe-t,hwe-u,hwe-v,hwe-w,ga-16.04",
        "architecture": "amd64/hwe-16.04-lowlatency"
    },
    {
        "id": 67,
        "type": "Synced",
        "resource_uri": "/MAAS/api/2.0/boot-resources/67/",
        "name": "ubuntu/xenial",
        "subarches": "generic,hwe-p,hwe-q,hwe-r,hwe-s,hwe-t,hwe-u,hwe-v,hwe-w,ga-16.04,hwe-16.04,hwe-16.10",
        "architecture": "amd64/hwe-16.04-lowlatency-edge"
    },
    {
        "id": 50,
        "type": "Synced",
        "resource_uri": "/MAAS/api/2.0/boot-resources/50/",
        "name": "ubuntu/yakkety",
        "subarches": "generic,hwe-p,hwe-q,hwe-r,hwe-s,hwe-t,hwe-u,hwe-v,hwe-w,ga-16.04,ga-16.10",
        "architecture": "amd64/ga-16.10"
    },
    {
        "id": 56,
        "type": "Synced",
        "resource_uri": "/MAAS/api/2.0/boot-resources/56/",
        "name": "ubuntu/yakkety",
        "subarches": "generic,hwe-p,hwe-q,hwe-r,hwe-s,hwe-t,hwe-u,hwe-v,hwe-w,ga-16.04,ga-16.10",
        "architecture": "amd64/ga-16.10-lowlatency"
    },
    {
        "id": 57,
        "type": "Synced",
        "resource_uri": "/MAAS/api/2.0/boot-resources/57/",
        "name": "ubuntu/yakkety",
        "subarches": "generic,hwe-p,hwe-q,hwe-r,hwe-s,hwe-t,hwe-u,hwe-v,hwe-w,ga-16.04,ga-16.10",
        "architecture": "amd64/hwe-16.10"
    },
    {
        "id": 60,
        "type": "Synced",
        "resource_uri": "/MAAS/api/2.0/boot-resources/60/",
        "name": "ubuntu/yakkety",
        "subarches": "generic,hwe-p,hwe-q,hwe-r,hwe-s,hwe-t,hwe-u,hwe-v,hwe-w,ga-16.04,ga-16.10",
        "architecture": "amd64/hwe-16.10-lowlatency"
    },
    {
        "id": 59,
        "type": "Synced",
        "resource_uri": "/MAAS/api/2.0/boot-resources/59/",
        "name": "ubuntu/zesty",
        "subarches": "generic,hwe-p,hwe-q,hwe-r,hwe-s,hwe-t,hwe-u,hwe-v,hwe-w,ga-16.04,ga-16.10,ga-17.04",
        "architecture": "amd64/ga-17.04"
    },
    {
        "id": 58,
        "type": "Synced",
        "resource_uri": "/MAAS/api/2.0/boot-resources/58/",
        "name": "ubuntu/zesty",
        "subarches": "generic,hwe-p,hwe-q,hwe-r,hwe-s,hwe-t,hwe-u,hwe-v,hwe-w,ga-16.04,ga-16.10,ga-17.04",
        "architecture": "amd64/ga-17.04-lowlatency"
    },
    {
        "id": 48,
        "resource_uri": "/MAAS/api/2.0/boot-resources/48/",
        "type": "Uploaded",
        "title": "Ubuntu 12.04.1 (amd64)",
        "name": "u12.04.1_amd64",
        "subarches": "generic",
        "architecture": "amd64/generic"
    },
    {
        "id": 47,
        "resource_uri": "/MAAS/api/2.0/boot-resources/47/",
        "type": "Uploaded",
        "title": "Ubuntu 12.04.2 (amd64)",
        "name": "u12.04.2_amd64",
        "subarches": "generic",
        "architecture": "amd64/generic"
    },
    {
        "id": 46,
        "resource_uri": "/MAAS/api/2.0/boot-resources/46/",
        "type": "Uploaded",
        "title": "Ubuntu 12.04.3 (amd64)",
        "name": "u12.04.3_amd64",
        "subarches": "generic",
        "architecture": "amd64/generic"
    },
    {
        "id": 45,
        "resource_uri": "/MAAS/api/2.0/boot-resources/45/",
        "type": "Uploaded",
        "title": "Ubuntu 12.04.4 (amd64)",
        "name": "u12.04.4_amd64",
        "subarches": "generic",
        "architecture": "amd64/generic"
    },
    {
        "id": 44,
        "resource_uri": "/MAAS/api/2.0/boot-resources/44/",
        "type": "Uploaded",
        "title": "Ubuntu 12.04.5 (amd64)",
        "name": "u12.04.5_amd64",
        "subarches": "generic",
        "architecture": "amd64/generic"
    },
    {
        "id": 49,
        "resource_uri": "/MAAS/api/2.0/boot-resources/49/",
        "type": "Uploaded",
        "title": "Ubuntu 12.04 GA (amd64)",
        "name": "u12.04_amd64",
        "subarches": "generic",
        "architecture": "amd64/generic"
    },
    {
        "id": 42,
        "resource_uri": "/MAAS/api/2.0/boot-resources/42/",
        "type": "Uploaded",
        "title": "Ubuntu 14.04.1 GA (amd64)",
        "name": "u14.04.1_amd64",
        "subarches": "generic",
        "architecture": "amd64/generic"
    },
    {
        "id": 41,
        "resource_uri": "/MAAS/api/2.0/boot-resources/41/",
        "type": "Uploaded",
        "title": "Ubuntu 14.04.2 GA (amd64)",
        "name": "u14.04.2_amd64",
        "subarches": "generic",
        "architecture": "amd64/generic"
    },
    {
        "id": 40,
        "resource_uri": "/MAAS/api/2.0/boot-resources/40/",
        "type": "Uploaded",
        "title": "Ubuntu 14.04.3 GA (amd64)",
        "name": "u14.04.3_amd64",
        "subarches": "generic",
        "architecture": "amd64/generic"
    },
    {
        "id": 39,
        "resource_uri": "/MAAS/api/2.0/boot-resources/39/",
        "type": "Uploaded",
        "title": "Ubuntu 14.04.4 GA (amd64)",
        "name": "u14.04.4_amd64",
        "subarches": "generic",
        "architecture": "amd64/generic"
    },
    {
        "id": 38,
        "resource_uri": "/MAAS/api/2.0/boot-resources/38/",
        "type": "Uploaded",
        "title": "Ubuntu 14.04.5 GA (amd64)",
        "name": "u14.04.5_amd64",
        "subarches": "generic",
        "architecture": "amd64/generic"
    },
    {
        "id": 43,
        "resource_uri": "/MAAS/api/2.0/boot-resources/43/",
        "type": "Uploaded",
        "title": "Ubuntu 14.04 GA (amd64)",
        "name": "u14.04_amd64",
        "subarches": "generic",
        "architecture": "amd64/generic"
    },
    {
        "id": 9,
        "resource_uri": "/MAAS/api/2.0/boot-resources/9/",
        "type": "Uploaded",
        "title": "Ubuntu 16.04.1 GA (amd64)",
        "name": "u16.04.1_amd64",
        "subarches": "generic",
        "architecture": "amd64/generic"
    },
    {
        "id": 37,
        "resource_uri": "/MAAS/api/2.0/boot-resources/37/",
        "type": "Uploaded",
        "title": "Ubuntu 16.04 GA (amd64)",
        "name": "u16.04_amd64",
        "subarches": "generic",
        "architecture": "amd64/generic"
    }
]