如何修复'ModuleNotFoundError：没有名为'apt_pkg'的模块？

Question

I'm running code sudo apt update and fetch error

ModuleNotFoundError: No module named 'apt_pkg'.

Please, help me solve it.

sudo apt update


Hit:20 http://ppa.launchpad.net/xorg-edgers/ppa/ubuntu bionic InRelease       
Fetched 93,3 kB in 2s (42,4 kB/s)                   
Traceback (most recent call last):
  File "/usr/lib/cnf-update-db", line 8, in <module>
    from CommandNotFound.db.creator import DbCreator
  File "/usr/lib/python3/dist-packages/CommandNotFound/db/creator.py", line 11, in <module>
    import apt_pkg
ModuleNotFoundError: No module named 'apt_pkg'
Reading package lists... Done
E: Problem executing scripts APT::Update::Post-Invoke-Success 'if /usr/bin/test -w /var/lib/command-not-found/ -a -e /usr/lib/cnf-update-db; then /usr/lib/cnf-update-db > /dev/null; fi'
E: Sub-process returned an error code

Answer 1

Just reinstalled python3-apt and the error disappeared

sudo apt remove python3-apt

restart and then install,

sudo apt install python3-apt

NOTE: Use only if, python3 is a new installation dependency. Else it can screw existing python3 based setups on your system. Use of --reinstall is a safer bet though.

Answer 2

In my case the problem was due to upgrading python version from 3.6 to 3.8 .

sudo update-alternatives --install /usr/bin/python3 python3 /usr/bin/python3.6 1
sudo update-alternatives --install /usr/bin/python3 python3 /usr/bin/python3.8 2

sudo update-alternatives --config python3

Solved by:

Settings back the python version to 3.6

Answer 3

In my case, the problem was that I removed original /usr/bin/python3 symlink on Ubuntu 18.04 and replaced it with one pointing to python3.8 . Problem disappeared when I restored the original pointing to python3.6

My takeaway is: if you need custom version of some library or module, install it in an isolated environment, do not mess up with system settings. Otherwise you are at risk of breaking something which can be noticed only later when it's difficult to figure out what exactly is wrong.

Answer 4

我遇到了这个问题，这是因为我安装了 python 3.6.9 和 3.5.2（Ubuntu 16.04）我还使用了sudo update-alternatives --config python3不使用auto设置它来auto为我解决了这个问题（然后给予 3.6.9 优先级是让最新版本的 python 默认运行的下一步）新用户：我无法回复其他评论 :(

Answer 5

The issue is caused by setting python3.7 or higher as default python3. @bluevalien like you said i had to use sudo update-alternatives --config pyhton3 and i set python3.6 as default. Sorry i cannot comment since i'm a new user too

Answer 6

You need change the Python version (3.6 works for me). But, if you want another python version by default (3.8 for example):

Try editing the file /usr/bin/add-apt-repository and changing out the line #!/usr/bin/python3 with the specific version of python (like 3.6).

To change this file, open a text editor (like nano):

sudo nano /usr/bin/add-apt-repository

Replace #!/usr/bin/python3 for your python version (3.6 in this case)

#!/usr/bin/python3.6

Save the file.

Should work.

Answer 7

I also had the issue with "cp: cannot stat 'apt_pkg.cpython-36m-x86_64-linux-gnu.so': No such file or directory while I was as super user. I did the same command withouth the sudo command and it worked fine.

I have in my system python 3.5, 3.6 and 3.7 , so I do not think the version of python is a problem.

cp apt_pkg.cpython-36m-x86-64-linux-gnu.so.so apt_pkg.so

Regards.

Answer 8

24.12.2022

i also got this error when almost run any command, it shows that the file in

/usr/lib/python3/dist-packages/CommandNotFound/CommandNotFound.py

couldnt import apt_pkg

there could be several reasons that cause this prob., but i'd suggest not to directly remove and reinstall python3-apt, could be problematic, the first try could be check if you have updated the default python3 to a higher version before, like by me, i've updated the default python3 to python3.10, and that's why this error comes up. Run

sudo update-alternatives --config python3

to rechoose the default, by selecting the old one(python3.8 by me), the "no module named apt_pkg" error has been eliminated.

Btw, a tip also a memo for myself, next time when someone wanna run process on new python environment, it could be very safe and nice to just create a virtual env using conda, no conflict with the current OS(Ubuntu 20.04 by me for example).

Answer 9

Similar to some, I have python3.8 and python3.11 where python and python3 both are symlinks to python3.11 in /usr/bin

I ran the following which fixed the issue:

cd /usr/lib/python3/dist-packages/
sudo cp apt_pkg.cpython-38-x86_64-linux-gnu.so apt_pkg.so