Error in sys.excepthook: ModuleNotFoundError: No module named 'apt_pkg'

Thanks for taking your time to report this issue and help making Ubuntu better.

I get the same error when I follow your example on Ubuntu Yakkety. I don't get a stacktrace if I attempt the same with python3.5

What version of python3-apport and python3-apt do you have installed?

It might be that the python3-apt package isn't setup for python3.6.

Brian, this is straight up what it is...

On 10 Oct 2016 20:46, "Brian Murray" <email address hidden> wrote:

> It might be that the python3-apt package isn't setup for python3.6.
>
> --
> You received this bug notification because you are subscribed to the bug
> report.
> https://bugs.launchpad.net/bugs/1631367
>
> Title:
> Error in sys.excepthook: ModuleNotFoundError: No module named
> 'apt_pkg'
>
> Status in python3.6 package in Ubuntu:
> Confirmed
>
> Bug description:
> Errors that are supposed to be handled by the except hook fail due to
> incompatible apt_pkg module
>
> $ python3.6
> Python 3.6.0b1 (default, Sep 17 2016, 12:08:22)
> [GCC 6.2.0 20160914] on linux
> Type "help", "copyright", "credits" or "license" for more information.
> >>> foop
> Traceback (most recent call last):
> File "<stdin>", line 1, in <module>
> NameError: name 'foop' is not defined
> Error in sys.excepthook:
> Traceback (most recent call last):
> File "/usr/lib/python3/dist-packages/apport_python_hook.py", line 63,
> in apport_excepthook
> from apport.fileutils import likely_packaged, get_recent_crashes
> File "/usr/lib/python3/dist-packages/apport/__init__.py", line 5, in
> <module>
> from apport.report import Report
> File "/usr/lib/python3/dist-packages/apport/report.py", line 30, in
> <module>
> import apport.fileutils
> File "/usr/lib/python3/dist-packages/apport/fileutils.py", line 23,
> in <module>
> from apport.packaging_impl import impl as packaging
> File "/usr/lib/python3/dist-packages/apport/packaging_impl.py", line
> 23, in <module>
> import apt
> File "/usr/lib/python3/dist-packages/apt/__init__.py", line 23, in
> <module>
> import apt_pkg
> ModuleNotFoundError: No module named 'apt_pkg'
>
> Original exception was:
> Traceback (most recent call last):
> File "<stdin>", line 1, in <module>
> NameError: name 'foop' is not defined
> >>>
>
> ProblemType: Bug
> DistroRelease: Ubuntu 16.10
> Package: python3.6 3.6.0~b1-1ubuntu2
> ProcVersionSignature: Ubuntu 4.8.0-17.19-generic 4.8.0-rc7
> Uname: Linux 4.8.0-17-generic x86_64
> ApportVersion: 2.20.3-0ubuntu7
> Architecture: amd64
> CurrentDesktop: GNOME
> Date: Fri Oct 7 12:08:38 2016
> InstallationDate: Installed on 2016-01-05 (275 days ago)
> InstallationMedia: Ubuntu 15.10 "Wily Werewolf" - Release amd64
> (20151021)
> SourcePackage: python3.6
> UpgradeStatus: No upgrade log present (probably fresh install)
>
> To manage notifications about this bug go to:
> https://bugs.launchpad.net/ubuntu/+source/python3.6/+bug/
> 1631367/+subscriptions
>

>What version of python3-apport and python3-apt do you have installed?

python3-apport: 2.20.3-0ubuntu8
python3-apt: 1.1.0~beta5

(I also suspect it isn't set up for python3.6)

I did some digging into this here: https://bitbucket.org/fkpackaging/deadsnakes-issues/issues/39/looking-for-a-new-maintainer#comment-33484057

The "default" python in zesty is python3.5, since python3.6 is a non-default python, it should install dist-packages into /usr/lib/python3.6/dist-packages instead of /usr/lib/python3/dist-packages (at least if I'm correct :D)

This shouldn't be "priority low". Apport breaks the Python 3.6 package. At least all desktop users trying to use Python 3.6 should be affected.

To summarise the problem, python3-apt has a C module which is only compiled for Python 3.5, but Python 3.6 needs it to run the apport.

Some possible possible workarounds:
* Get rid of the symlink: rm /usr/lib/python3.6/sitecustomize.py

* Change /etc/sitecustomize.py to not install the hook if apt_pkg is available

    # install the apport exception handler if available
    try:
        import apport_python_hook
        import apt_pkg # <-- Add this line
    except ImportError:
        pass
    else:
        apport_python_hook.install()

* Install the apt module

    $ sudo apt install python3.6-dev libapt-pkg-dev python3-distutils-extra # Get build requirements
    $ wget https://bootstrap.pypa.io/get-pip.py # Get pip
    $ python3.6 get-pip.py
    $ python3.6 /usr/bin/pip3 install http://launchpad.net/python-distutils-extra/trunk/2.28/+download/python-distutils-extra-2.28.tar.gz # install apt requirments
    $ python3.6 /usr/bin/pip3 install https://launchpad.net/ubuntu/+archive/primary/+files/python-apt_1.1.0~beta1build1.tar.xz # install apt package for Python 3.6

I am using python3.6.2 on ubuntu 17

Error in sys.excepthook:
Traceback (most recent call last):
  File "/usr/lib/python3/dist-packages/apport_python_hook.py", line 63, in apport_excepthook
    from apport.fileutils import likely_packaged, get_recent_crashes
  File "/usr/lib/python3/dist-packages/apport/__init__.py", line 5, in <module>
    from apport.report import Report
  File "/usr/lib/python3/dist-packages/apport/report.py", line 30, in <module>
    import apport.fileutils
  File "/usr/lib/python3/dist-packages/apport/fileutils.py", line 23, in <module>
    from apport.packaging_impl import impl as packaging
  File "/usr/lib/python3/dist-packages/apport/packaging_impl.py", line 24, in <module>
    import apt
  File "/usr/lib/python3/dist-packages/apt/__init__.py", line 23, in <module>
    import apt_pkg
ModuleNotFoundError: No module named 'apt_pkg'

I tried this and it worked. I didn't need to get pip because I already had it, but that's okay, I construe it as an "abundance of caution" step and I commend you.

BEFORE:
```
    >>> dir(rdatatype)
    Traceback (most recent call last):
      File "<stdin>", line 1, in <module>
    NameError: name 'rdatatype' is not defined
    Error in sys.excepthook:
    Traceback (most recent call last):
      File "/usr/lib/python3/dist-packages/apport_python_hook.py", line 63, in apport_excepthook
        from apport.fileutils import likely_packaged, get_recent_crashes
      File "/usr/lib/python3/dist-packages/apport/__init__.py", line 5, in <module>
        from apport.report import Report
      File "/usr/lib/python3/dist-packages/apport/report.py", line 30, in <module>
        import apport.fileutils
      File "/usr/lib/python3/dist-packages/apport/fileutils.py", line 23, in <module>
        from apport.packaging_impl import impl as packaging
      File "/usr/lib/python3/dist-packages/apport/packaging_impl.py", line 24, in <module>
        import apt
      File "/usr/lib/python3/dist-packages/apt/__init__.py", line 23, in <module>
        import apt_pkg
    ModuleNotFoundError: No module named 'apt_pkg'

    Original exception was:
    Traceback (most recent call last):
      File "<stdin>", line 1, in <module>
    NameError: name 'rdatatype' is not defined
    >>>
```

After:
```
    >>> dir(rdatatype)
    Traceback (most recent call last):
      File "<stdin>", line 1, in <module>
    NameError: name 'rdatatype' is not defined
    >>>

```

IMHO, you have the correct fix for this issue. You probably already knew that.