Turning off the logging to skip the graphs, results in:

Traceback (most recent call last):
  File "/usr/bin/kubuntu-retry-builds", line 90, in <module>
    lp = Launchpad.login_with("kubuntu-retry-builds", "production")
  File "/usr/lib/python3/dist-packages/launchpadlib/launchpad.py", line 549, in login_with
    credential_save_failed, version)
  File "/usr/lib/python3/dist-packages/launchpadlib/launchpad.py", line 352, in _authorize_token_and_login
    authorization_engine.unique_consumer_id)
  File "/usr/lib/python3/dist-packages/launchpadlib/credentials.py", line 337, in load
    return self.do_load(unique_key)
  File "/usr/lib/python3/dist-packages/launchpadlib/credentials.py", line 391, in do_load
    'launchpadlib', unique_key)                                                                                                                                                                                                                                                 
  File "/usr/lib/python3/dist-packages/keyring/core.py", line 41, in get_password                                                                                                                                                                                               
    return _keyring_backend.get_password(service_name, username)                                                                                                                                                                                                                
  File "/usr/lib/python3/dist-packages/keyring/backends/SecretService.py", line 65, in get_password                                                                                                                                                                             
    return item.get_secret().decode('utf-8')                                                                                                                                                                                                                                    
  File "/usr/lib/python3/dist-packages/secretstorage/item.py", line 102, in get_secret                                                                                                                                                                                          
    decryptor = Cipher(aes, modes.CBC(aes_iv), default_backend()).decryptor()                                                                                                                                                                                                   
  File "/usr/lib/python3/dist-packages/cryptography/hazmat/backends/__init__.py", line 71, in default_backend                                                                                                                                                                   
    _default_backend = MultiBackend(_available_backends())                                                                                                                                                                                                                      
  File "/usr/lib/python3/dist-packages/cryptography/hazmat/backends/__init__.py", line 28, in _available_backends                                                                                                                                                               
    "cryptography.backends"                                                                                                                                                                                                                                                     
  File "/usr/lib/python3/dist-packages/cryptography/hazmat/backends/__init__.py", line 27, in <listcomp>                                                                                                                                                                        
    for ep in pkg_resources.iter_entry_points(                                                                                                                                                                                                                                  
  File "/usr/lib/python3/dist-packages/pkg_resources/__init__.py", line 2309, in resolve                                                                                                                                                                                        
    module = __import__(self.module_name, fromlist=['__name__'], level=0)                                                                                                                                                                                                       
  File "/usr/lib/python3/dist-packages/cryptography/hazmat/backends/openssl/__init__.py", line 7, in <module>                                                                                                                                                                   
    from cryptography.hazmat.backends.openssl.backend import backend                                                                                                                                                                                                            
  File "/usr/lib/python3/dist-packages/cryptography/hazmat/backends/openssl/backend.py", line 17, in <module>                                                                                                                                                                   
    from cryptography import utils, x509                                                                                                                                                                                                                                        
  File "/usr/lib/python3/dist-packages/cryptography/x509/__init__.py", line 7, in <module>                                                                                                                                                                                      
    from cryptography.x509.base import (                                                                                                                                                                                                                                        
  File "/usr/lib/python3/dist-packages/cryptography/x509/base.py", line 16, in <module>                                                                                                                                                                                         
    from cryptography.x509.extensions import Extension, ExtensionType                                                                                                                                                                                                           
  File "/usr/lib/python3/dist-packages/cryptography/x509/extensions.py", line 20, in <module>                                                                                                                                                                                   
    from cryptography.hazmat.primitives import constant_time, serialization                                                                                                                                                                                                     
  File "/usr/lib/python3/dist-packages/cryptography/hazmat/primitives/constant_time.py", line 9, in <module>                                                                                                                                                                    
    from cryptography.hazmat.bindings._constant_time import lib                                                                                                                                                                                                                 
ImportError: No module named '_cffi_backend'