Problems when installing python3-dev

Question

This problem has been torturing me for 2 days, and without python3-dev I can't pip install any module, can someone tell how could I solve this?

The following packages have unmet dependencies:
     python3-dev : Depends: python3 (= 3.5.1-3) but 3.5.1-4 is to be installed
                   Depends: libpython3-dev (= 3.5.1-3) but it is not going to be installed
                   Depends: python3.5-dev (>= 3.5.1-2~) but it is not going to be installed
    E: Unable to correct problems, you have held broken packages.

This is problem with the apt ubuntu/debian package manager being in an inconsistent state. The question belongs on the askubuntu stackexchange site. How do I resolve The following packages have unmet dependencies — Håken Lid
– Håken Lid, Commented Oct 19, 2018 at 11:26
First of all run apt update after try apt remove python3 and now try to install python3-dev. — Gordio
– Gordio, Commented Oct 20, 2018 at 1:35

David17 · Accepted Answer · 2019-02-19 14:00:03Z

5

You can try to install package libpython3-dev instead of installing package python3-dev.

I have answered a similar question here: https://superuser.com/a/1407453/1000196

answered Feb 19, 2019 at 14:00

David17

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Dharman · Accepted Answer · 2021-06-07 15:03:05Z

2

I found a solution like this for myself on Ubuntu Desktop 20.04:

Go to "Software & Updates" application -> Then change your "Download from" server to "Main server". After this close and go terminal. Then sudo apt update -y && sudo apt upgrade -y && sudo apt autoremove && sudo apt install python3-dev -y

edited Jun 7, 2021 at 15:03

Dharman♦

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answered Jun 7, 2021 at 14:57

Hiko Moff

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eraul · Accepted Answer · 2022-04-22 08:06:46Z

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I met this issue, and I fixed it with steps below:

I tried to install libpython3-dev or python3.7-dev, it told me that "Depends: libexpat1-dev but it is not going to be installed"
So I tried to install libexpat1-dev, it told me that "Depends: libexpat1 (= 2.2.6-2+deb10u4) but 2.2.6-2+deb10u1 is to be installed"
Then I update libexpat1 version to 2.2.6-2+deb10u4 with command "sudo apt-get install libexpat1=2.2.6-2+deb10u4"
Next, I installed libexpat1-dev, python3.7-dev, python3-dev with command below:

sudo apt-get install libexpat1-dev
sudo apt-get install python3.7-dev
sudo apt-get install python3-dev

answered Apr 22, 2022 at 8:06

eraul

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