It's strange that you would hit this error. We should be able to import
is_validator; I can see that formencode has been installed. Can you
paste the output of these commands into the bug (my example output shown
for comparison):

$ python -c "from formencode import validators"
$ python -c "import formencode; print(formencode.__file__)"
/usr/lib/python2.7/dist-packages/formencode/__init__.pyc
$ dpkg -S /usr/lib/python2.7/dist-packages/formencode/validators.py
python-formencode: /usr/lib/python2.7/dist-packages/formencode/validators.py
$ dpkg -S $(python -c "import formencode; 
print(formencode.__file__.replace('.pyc', '.py'))")
python-formencode: /usr/lib/python2.7/dist-packages/formencode/__init__.py

** Changed in: maas
       Status: New => Incomplete

** Changed in: maas (Ubuntu)
       Status: New => Incomplete

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https://bugs.launchpad.net/bugs/1536395

Title:
  package maas-cluster-controller 1.8.3+bzr4053-0ubuntu1 failed to
  install/upgrade: sub-processo script post-installation instalado
  retornou estado de saída de erro 1

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