Hello and thank you for filing this bug report.

It seems like you must have some local configuration change, as the
issue is:

Preparing to unpack .../python-cryptography_1.2.3-1ubuntu0.1_i386.deb ...
  File "/usr/bin/pyclean", line 63
    except (IOError, OSError), e:
                             ^
SyntaxError: invalid syntax
dpkg: warning: subprocess old pre-removal script returned error exit status 1
dpkg: trying script from the new package instead ...
  File "/usr/bin/pyclean", line 63
    except (IOError, OSError), e:
                             ^
SyntaxError: invalid syntax
dpkg: error processing archive 
/var/cache/apt/archives/python-cryptography_1.2.3-1ubuntu0.1_i386.deb 
(--unpack):
 subprocess new pre-removal script returned error exit status 1

which is not a syntax error in python2, but is in python3. Did you by
any chance change your default python interpreter (/usr/bin/python) to
python3 (not recommended or allowed by PEP).

Can you provide:

apt-cache policy python-minimal
python -V

outputs?

** Changed in: python-cryptography (Ubuntu)
       Status: New => Incomplete

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https://bugs.launchpad.net/bugs/1647901

Title:
  package python-cryptography 1.2.3-1 failed to install/upgrade:
  subprocess new pre-removal script returned error exit status 1

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