I can duplicate this on two identical systems, both upgraded from precise through to trusty:

root@xamot:/var/www# apt-get install maas
Reading package lists... Done
Building dependency tree       
Reading state information... Done
The following extra packages will be installed:
  maas-region-controller
The following NEW packages will be installed:
  maas maas-region-controller
0 upgraded, 2 newly installed, 0 to remove and 0 not upgraded.
Need to get 0 B/6,754 B of archives.
After this operation, 93.2 kB of additional disk space will be used.
Do you want to continue? [Y/n] 
Selecting previously unselected package maas-region-controller.
(Reading database ... 128110 files and directories currently installed.)
Preparing to unpack .../maas-region-controller_1.5.2+bzr2282-0ubuntu0.2_all.deb ...
Unpacking maas-region-controller (1.5.2+bzr2282-0ubuntu0.2) ...
Selecting previously unselected package maas.
Preparing to unpack .../maas_1.5.2+bzr2282-0ubuntu0.2_all.deb ...
Unpacking maas (1.5.2+bzr2282-0ubuntu0.2) ...
Setting up maas-region-controller (1.5.2+bzr2282-0ubuntu0.2) ...
Considering dependency proxy for proxy_http:
Module proxy already enabled
Module proxy_http already enabled
Module expires already enabled
Module wsgi already enabled
rsyslog stop/waiting
rsyslog start/running, process 12044
squid-deb-proxy stop/waiting
squid-deb-proxy start/running, process 12100
 * Restarting message broker rabbitmq-server                                                                                                                                   [ OK ] 
Changing password for user "maas_longpoll" ...
...done.
Changing password for user "maas_workers" ...
...done.
 * Restarting PostgreSQL 9.3 database server                                                                                                                                   [ OK ] 
dbconfig-common: writing config to /etc/dbconfig-common/maas-region-controller.conf
creating postgres user maas:  success.
verifying creation of user: success.
creating database maasdb: success.
verifying database maasdb exists: success.
dbconfig-common: flushing administrative password
Syncing...
Creating tables ...
Creating table auth_permission
Creating table auth_group_permissions
Creating table auth_group
Creating table auth_user_groups
Creating table auth_user_user_permissions
Creating table auth_user
Creating table django_content_type
Creating table django_session
Creating table django_site
Creating table piston_nonce
Creating table piston_consumer
Creating table piston_token
Creating table south_migrationhistory
Installing custom SQL ...
Installing indexes ...
Installed 0 object(s) from 0 fixture(s)

Synced:
 > django.contrib.auth
 > django.contrib.contenttypes
 > django.contrib.sessions
 > django.contrib.sites
 > django.contrib.messages
 > django.contrib.staticfiles
 > piston
 > south

Not synced (use migrations):
 - maasserver
 - metadataserver
(use ./manage.py migrate to migrate these)
UnknownMigration: Migration 'maasserver:0072_remove_ipmi_autodetect' probably doesn't exist.
Traceback (most recent call last):
  File "/usr/lib/python2.7/dist-packages/south/migration/base.py", line 297, in migration
    migration = __import__(full_name, {}, {}, ['Migration'])
  File "/usr/lib/python2.7/dist-packages/maasserver/migrations/0072_remove_ipmi_autodetect.py", line 4, in <module>
    from django.db.utils import ProgrammingError
ImportError: cannot import name ProgrammingError