package python3-pytango 8.1.8-1 failed to install/upgrade: subprocess installed post-installation script returned error exit status 1

[Nguyen Nhu Tuan]

python3-pytango fails to install in Xenial with the following error message:
Setting up python3-pytango (8.1.8-1) ...
  File "/usr/lib/python3/dist-packages/PyTango/tango_gevent.py", line 56
    raise result.error_string, None, result.tb
                             ^
SyntaxError: invalid syntax

dpkg: error processing package python3-pytango (--configure):
 subprocess installed post-installation script returned error exit status 1

[Test Case]
In a system running Ubuntu 16.04 (Xenial), try installing the python3-pytango package. It will fail with the above error.

[Regression Potential]
None that I can think of. This is fixing a package that can't be installed in the first place.

ProblemType: Package
DistroRelease: Ubuntu 16.04
Package: python3-pytango 8.1.8-1
ProcVersionSignature: Ubuntu 4.4.0-47.68-generic 4.4.24
Uname: Linux 4.4.0-47-generic x86_64
ApportVersion: 2.20.1-0ubuntu2.1
Architecture: amd64
Date: Mon Nov 7 17:07:07 2016
ErrorMessage: subprocess installed post-installation script returned error exit status 1
InstallationDate: Installed on 2016-11-07 (7 days ago)
InstallationMedia: Ubuntu 16.04.1 LTS "Xenial Xerus" - Release amd64 (20160719)
RelatedPackageVersions:
 dpkg 1.18.4ubuntu1.1
 apt 1.2.12~ubuntu16.04.1
SourcePackage: pytango
Title: package python3-pytango 8.1.8-1 failed to install/upgrade: subprocess installed post-installation script returned error exit status 1
UpgradeStatus: No upgrade log present (probably fresh install)

[Launchpad Janitor (janitor)]

Status changed to 'Confirmed' because the bug affects multiple users.

[bharatgourabdas (bharatgourabdas)]

I have xubuntu 16 LTS fresh install, and python 2.7( default )
I manually installed python3.5 with everything that matches python3.* pattern(apt-get install python3.*).

[Brian Murray (brian-murray)]

Hello Nguyen, or anyone else affected,

Accepted pytango into xenial-proposed. The package will build now and be available at https://launchpad.net/ubuntu/+source/pytango/8.1.8-1ubuntu0.1 in a few hours, and then in the -proposed repository.

Please help us by testing this new package. See https://wiki.ubuntu.com/Testing/EnableProposed for documentation on how to enable and use -proposed. Your feedback will aid us getting this update out to other Ubuntu users.

If this package fixes the bug for you, please add a comment to this bug, mentioning the version of the package you tested and change the tag from verification-needed-xenial to verification-done-xenial. If it does not fix the bug for you, please add a comment stating that, and change the tag to verification-failed-xenial. In either case, without details of your testing we will not be able to proceed.

Further information regarding the verification process can be found at https://wiki.ubuntu.com/QATeam/PerformingSRUVerification . Thank you in advance for helping!

N.B. The updated package will be released to -updates after the bug(s) fixed by this package have been verified and the package has been in -proposed for a minimum of 7 days.

[Mathew Hodson (mhodson)]

Verified fixed with 8.1.8-1ubuntu0.1.

$ sudo apt install python3-pytango=8.1.8-1 --no-install-recommends
[...]
Setting up python3-pytango (8.1.8-1) ...
  File "/usr/lib/python3/dist-packages/PyTango/tango_gevent.py", line 56
    raise result.error_string, None, result.tb
                             ^
SyntaxError: invalid syntax

dpkg: error processing package python3-pytango (--configure):
 subprocess installed post-installation script returned error exit status 1

$ sudo apt install python3-pytango=8.1.8-1ubuntu0.1 --no-install-recommends
[...]
Preparing to unpack .../python3-pytango_8.1.8-1ubuntu0.1_amd64.deb ...
Unpacking python3-pytango (8.1.8-1ubuntu0.1) over (8.1.8-1) ...
Setting up python3-pytango (8.1.8-1ubuntu0.1) ...
$

[Launchpad Janitor (janitor)]

This bug was fixed in the package pytango - 8.1.8-1ubuntu0.1

---------------
pytango (8.1.8-1ubuntu0.1) xenial; urgency=medium

  [ Picca Frédéric-Emmanuel ]
  * debian/patches
    - 0001-Fix-syntax-error-in-python-3.patch (Closes: #814824)

  [ Logan Rosen ]
  * Upload 8.1.8-2 to Xenial to fix python3-pytango installation
    bug (LP: #1641790).

 -- Logan Rosen <email address hidden> Sat, 08 Dec 2018 22:34:10 -0500

[Chris Halse Rogers (raof)]

The verification of the Stable Release Update for pytango has completed successfully and the package has now been released to -updates. Subsequently, the Ubuntu Stable Release Updates Team is being unsubscribed and will not receive messages about this bug report. In the event that you encounter a regression using the package from -updates please report a new bug using ubuntu-bug and tag the bug report regression-update so we can easily find any regressions.