sudo maas changepassword <user>, where user is the user you want the password changed:

cerdea@capiau:/var/log/maas$ sudo maas changepassword maas-root

Changing password for user 'maas-root' 

Password: 

Password (again): 

Password changed successfully for user 'maas-root'

cerdea@capiau:/var/log/maas$

Of course, you may need to find which user to change the password for:

matsubara@tancho [~]$ sudo maas shell



In [1]: from maasserver.models import User



In [2]: User.objects.all()

Out[2]: [<User: maas-init-node>, <User: admin>]



In [3]: