14

I'm rather new to Ubuntu and I'm trying to run update-manager on Ubuntu 13.10. I get:

jacopo@jacopo-laptop:~$ update-manager 
Traceback (most recent call last):
  File "/usr/bin/update-manager", line 28, in <module>
    from gi.repository import Gtk
  File "/usr/lib/python3/dist-packages/gi/__init__.py", line 27, in <module> from ._gi import _API
ImportError: No module named 'gi._gi'
Error in sys.excepthook:
Traceback (most recent call last):
  File "/usr/lib/python3/dist-packages/apport_python_hook.py", line 64, 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 20, in <module>
import apt
File "/usr/lib/python3/dist-packages/apt/__init__.py", line 21, in <module>
import apt_pkg
ImportError: No module named 'apt_pkg'

Original exception was:
Traceback (most recent call last):
File "/usr/bin/update-manager", line 28, in <module>
from gi.repository import Gtk
File "/usr/lib/python3/dist-packages/gi/__init__.py", line 27, in <module>
from ._gi import _API
ImportError: No module named 'gi._gi'

As far as I have understood, this is a problem related to the fact that I should have python3.4 installed. I installed it in /usr/local/lib, but I always get the same error. In this way I can't even upgrade to Ubuntu 14.04.

30

Reinstall apt_pkg using:

sudo apt-get install --reinstall python3-apt

The error is primarily because of library apt_pkg.cpython-35m-x86_64-linux-gnu.so not being present in /usr/lib/python3/dist-packages.

Removing and reinstalling should help.

  • 12
    It's almost always preferable to reinstall the package in one step using sudo apt install --reinstall <package-name>, because this avoids calculating and removing dependencies (and marking packages for removal). Be aware that removing packages is not always a reversible procedure; for example APT will remove itself or its dependencies if asked to! The --reinstall flag is therefore much safer than remove followed by install. The remove command by itself does not remove configuration files of a package so has no benefit over install --reinstall. – Zanna Aug 8 '18 at 7:58
  • Perfect! It worked for me! – Francis Rodrigues Apr 13 at 19:30
  • 8
    Now I am getting following error: sudo: add-apt-repository: command not found @vikas kapdoskar – alper May 12 at 16:31
  • sudo: add-apt-repository: command not found getting this error in ubuntu 16:04 – Tinkal Gogoi Jul 12 at 5:47
  • 3
    This answer should be updated with the suggestion by @Zanna, removing python3-apt will remove a ton of dependencies and may scare the crap out of someone, not to mention messing up their system. – alkanen Aug 1 at 8:08
6

for me the following steps worked:

cd /usr/lib/python3/dist-packages
sudo ln -s apt_pkg.cpython-{35m,34m}-x86_64-linux-gnu.so

the original solution is here: https://stackoverflow.com/questions/13708180/python-dev-installation-error-importerror-no-module-named-apt-pkg/36232975#36232975

  • 1
    As mentioned in a comment over at the "original solution," for me this worked: sudo ln -s apt_pkg.cpython-{35m,36m}-x86_64-linux-gnu.so. The 35 (python 3.5) version is what's installed regardless of the particular sub-version of python 3.x that you're running. Thanks! – fwc May 23 at 20:26
2

If you're trying to upgrade 13.10 to 14.04, try following these instructions. If you're just trying to update your current system from the command line, open a terminal and type the following:

sudo apt-get update
sudo apt-get dist-upgrade
  • Thanks. I had already tried but it didn't work. I tried once more now, getting, after apt-get update, the warning W: Failed to fetch bzip2:/var/lib/apt/lists/partial/it.archive.ubuntu.com_ubuntu_dists_saucy-updates_main_source_Sources Hash Sum mismatch – user291925 Jun 9 '14 at 14:22
  • K - you have a problem with the update sources. I've seen several threads about how to fix that The following link seems to be a good match for your question askubuntu.com/questions/41605/… – Charles Green Jun 9 '14 at 14:28
  • Thanks! I tried, but I still get the same error when running update-manager – user291925 Jun 9 '14 at 15:12
  • K - that about exhausts my possibilities with out a more extensive web search. Good luck! – Charles Green Jun 9 '14 at 15:22
2
update-alternatives  --set python3  /usr/bin/python3.6
  • 1
    Updating alternatives for python might sometimes break things. – Kulfy Apr 29 at 11:06
  • I used update-alternatives --set python3 /usr/bin/python3.5 and it worked. python3 was already pointing to python3.6 on my system. – Desik Jun 26 at 20:06
1

I have managed to solve this by copying apt_pkg.cpython-34m-i386-linux-gnu.so to /usr/lib/python3/dist-packages/ from another desktop running Ubuntu 14.04 LTS. I have tried almost all possibilities found over internet like, purging python installation and then reinstalling, cleaning broken upgrade files etc, but ended up with no success.

1

Just in case it helps another, I finally solved this problem, that was apparently caused by python version conflicts, by redirecting the link python3, then redirecting it to the right python version:

sudo rm /usr/bin/python3
sudo ln -s /usr/bin/python3.4

You may need to enter the correct python version, found with

python3 -V
  • So you removed one version for 3.4 ? – ThePassenger Jul 20 '18 at 13:49
1

Just an advise: I avoid installing "my" python on /usr/local, but I have one dedicated directory per python version (e.g. in /opt) and I'm using virtual environments on my user account to use the python I need, which is activated by my .profile

By this approach, you will always avoid to change the python system expected configuration and dependencies.

Well, I know, it's too late for your case, but...

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