For xenial:

With the current cloud-init, where the problem appears:
 *** 0.7.9-48-g1c795b9-0ubuntu1~16.04.1 500
        500 http://br.archive.ubuntu.com/ubuntu xenial-updates/main amd64 
Packages

# remove generated files
root@15-89:/run/cloud-init# rm cloud.cfg ds-identify.log

# cloud-init configuration, set via dpkg-reconfigure cloud-init and unchecking 
all items:
root@15-89:/run/cloud-init# cat /etc/cloud/cloud.cfg.d/90_dpkg.cfg 
# to update this file, run dpkg-reconfigure cloud-init
datasource_list: [  ]

# maas datasource config file, written to by MAAS:
root@15-89:/run/cloud-init# cat /etc/cloud/cloud.cfg.d/90_dpkg_maas.cfg 
# written by cloud-init debian package per preseed entries
# cloud-init/{maas-metadata-url,/maas-metadata-credentials}
datasource:
  MAAS: {consumer_key: L8SxaFb29L3rzc3Vw8, metadata_url: 
'http://10.0.5.5:5240/MAAS/metadata/',
    token_key: 92LGSD8NBTHbD7n7T8, token_secret: 
FAbznaWcx72ryaK6SrErnqeK2z9LH2Dj}

# let's call ds-identify:
root@15-89:/run/cloud-init# unset DS_MAIN
root@15-89:/run/cloud-init# /usr/lib/cloud-init/ds-identify

# and we have no MAAS in cloud.cfg (somehow it thinks ec2 could be a candidate):
root@15-89:/run/cloud-init# cat cloud.cfg 
di_report:
  datasource_list: [ Ec2, None ]
  datasource: {Ec2: {strict_id: "warn"}}

# the ds-identify log file has
root@15-89:/run/cloud-init# cat ds-identify.log
(...)
DSLIST=MAAS ConfigDrive NoCloud AltCloud Azure Bigstep CloudSigma CloudStack 
DigitalOcean Ec2 OpenNebula OpenStack OVF SmartOS
(...)
is_container=false
ec2 platform is 'Unknown'.
check for 'Ec2' returned maybe
1 datasources returned maybe: Ec2
[up 273.31s] returning 0


Now I install the package from proposed:
 *** 0.7.9-90-g61eb03fe-0ubuntu1~16.04.1 500
        500 http://br.archive.ubuntu.com/ubuntu xenial-proposed/main amd64 
Packages

90_dpkg.cfg still has an empty list:
root@15-89:/run/cloud-init# cat /etc/cloud/cloud.cfg.d/90_dpkg.cfg 
# to update this file, run dpkg-reconfigure cloud-init
datasource_list: [  ]

And repeat the steps. This time I get:
root@15-89:/run/cloud-init# cat cloud.cfg
di_report:
  datasource_list: [ MAAS, None ]

And the ds-identify log has:
(...)
DSLIST=MAAS ConfigDrive NoCloud AltCloud Azure Bigstep CloudSigma CloudStack 
DigitalOcean Ec2 GCE OpenNebula OpenStack OVF SmartOS
(...)
is_container=false
check for 'MAAS' returned found
ec2 platform is 'Unknown'.
check for 'Ec2' returned maybe
Found single datasource: MAAS
[up 401.41s] returning 0

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https://bugs.launchpad.net/bugs/1677710

Title:
  ds-identify does not find maas datasource

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