[Bug 1647901] Re: package python-cryptography 1.2.3-1 failed to install/upgrade: subprocess new pre-removal script returned error exit status 1

[Nish Aravamudan]

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

Status in python-cryptography package in Ubuntu:
  Incomplete

Bug description:
  Whe I'm connecting to the system display these error

  ProblemType: Package
  DistroRelease: Ubuntu 16.04
  Package: python-cryptography 1.2.3-1
  ProcVersionSignature: Ubuntu 4.4.0-51.72-generic 4.4.30
  Uname: Linux 4.4.0-51-generic i686
  NonfreeKernelModules: nvidia
  ApportVersion: 2.20.1-0ubuntu2.1
  Architecture: i386
  Date: Wed Nov 30 23:55:28 2016
  ErrorMessage: subprocess new pre-removal script returned error exit status 1
  InstallationDate: Installed on 2015-10-22 (411 days ago)
  InstallationMedia: Ubuntu 15.04 "Vivid Vervet" - Release i386 (20150422)
  RelatedPackageVersions:
   dpkg 1.18.4ubuntu1.1
   apt  1.2.15
  SourcePackage: python-cryptography
  Title: package python-cryptography 1.2.3-1 failed to install/upgrade: subprocess new pre-removal script returned error exit status 1
  UpgradeStatus: Upgraded to xenial on 2016-05-02 (218 days ago)

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