[Bug 2105455] Re: python3-venv : Depends: python3 (= 3.12.3-0ubuntu1) but 3.12.3-0ubuntu2 is to be installed

[Dima Tisnek]

I have ran `sudo apt update` more than a dozen times.

Policy after the fix is probably not informative:

apt-cache policy python3 python3-venv


python3:
  Installed: 3.12.3-0ubuntu1
  Candidate: 3.12.3-0ubuntu1
  Version table:
 *** 3.12.3-0ubuntu1 500
        500 http://mirror.kakao.com/ubuntu noble/main amd64 Packages
        100 /var/lib/dpkg/status
python3-venv:
  Installed: 3.12.3-0ubuntu1
  Candidate: 3.12.3-0ubuntu1
  Version table:
 *** 3.12.3-0ubuntu1 500
        500 http://mirror.kakao.com/ubuntu noble/universe amd64 Packages
        100 /var/lib/dpkg/status


My guess about what happened is that perhaps `3.12.3-0ubuntu2` got installed as part of the OS installed, I've downloaded ubuntu-24.04.2-desktop-amd64.iso on March 25 and then installed the system two days ago.

Here's what I can see in the /var/log/apt/history.log:

--- these are probably when the ISO was baked ---

Start-Date: 2025-02-15  08:09:50
Commandline: apt-get --yes -oDebug::pkgDepCache::AutoInstall=yes --force-yes upgrade
Upgrade: ... python3-minimal:amd64 (3.12.3-0ubuntu1, 3.12.3-0ubuntu2) ... python3:amd64 (3.12.3-0ubuntu1, 3.12.3-0ubuntu2) ... libpython3-stdlib:amd64 (3.12.3-0ubuntu1, 3.12.3-0ubuntu2) ...

Start-Date: 2025-02-15  08:10:24
Commandline: apt-get --yes -oDebug::pkgDepCache::AutoInstall=yes install ... python3-gdbm:amd64 (3.12.3-0ubuntu1) ...

--- these are probably when I installed the system from the flash drive
/ ISO ---

Start-Date: 2025-03-29  12:27:05
Commandline: apt-get --quiet --assume-yes --option=Dpkg::options::=--force-unsafe-io --option=Dpkg::Options::=--force-confold install efibootmgr grub-efi-amd64 grub-efi-amd64-signed shim-signed

(python not mentioned)

Start-Date: 2025-03-29  12:27:56
Commandline: apt-get --quiet --assume-yes --option=Dpkg::options::=--force-unsafe-io --option=Dpkg::Options::=--force-confold install linux-generic-hwe-24.04

(python not mentioned)

Start-Date: 2025-03-29  12:28:34
Commandline: apt-get --quiet --assume-yes --option=Dpkg::options::=--force-unsafe-io --option=Dpkg::Options::=--force-confold install wpasupplicant

(python not mentioned)

Start-Date: 2025-03-29  12:28:43
Commandline: apt-get --quiet --assume-yes --option=Dpkg::options::=--force-unsafe-io --option=Dpkg::Options::=--force-confold install wbritish

(python not mentioned)

Start-Date: 2025-03-29  12:29:19
Commandline: /usr/bin/unattended-upgrades -v
Upgrade: ... python3.12:amd64 (3.12.3-1ubuntu0.4, 3.12.3-1ubuntu0.5) ... python3.12-minimal:amd64 (3.12.3-1ubuntu0.4, 3.12.3-1ubuntu0.5) ... (and a few more like libpython3, same versions all across)

(I'm a but confused about these, TBH)

--- these are when I fixed my system ---

Start-Date: 2025-03-31  09:24:56
Commandline: apt install --allow-downgrades python3=3.12.3-0ubuntu1 python3-full=3.12.3-0ubuntu1 python3-doc=3.12.3-0ubuntu1 python3-examples=3.12.3-0ubuntu1 python3-minimal=3.12.3-0ubuntu1 libpython3-stdlib=3.12.3-0ubuntu1
Requested-By: dima (1000)
Install: ... 
Downgrade: python3-minimal:amd64 (3.12.3-0ubuntu2, 3.12.3-0ubuntu1), python3:amd64 (3.12.3-0ubuntu2, 3.12.3-0ubuntu1), libpython3-stdlib:amd64 (3.12.3-0ubuntu2, 3.12.3-0ubuntu1)


---


The best explanation I can come up with is that -0ubuntu2 was a real build at the time when ISO was made, and that build was since yanked.

https://launchpad.net/ubuntu/noble/+package/python3
lists 3.12.3-0ubuntu2 in proposed and updates
lists 3.12.3-0ubuntu1 in proposed and release

could it be that the install media either included a version too new?

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https://bugs.launchpad.net/bugs/2105455

Title:
  python3-venv : Depends: python3 (= 3.12.3-0ubuntu1) but
  3.12.3-0ubuntu2 is to be installed

Status in python3-defaults package in Ubuntu:
  Incomplete

Bug description:
  ommand: /usr/bin/apt-get install -y python3-venv
  Output:
  Reading package lists...
  Building dependency tree...
  Reading state information...
  Some packages could not be installed. This may mean that you have
  requested an impossible situation or if you are using the unstable
  distribution that some required packages have not yet been created
  or been moved out of Incoming.
  The following information may help to resolve the situation:

  The following packages have unmet dependencies:
   python3-venv : Depends: python3 (= 3.12.3-0ubuntu1) but 3.12.3-0ubuntu2 is to be installed

  
  Couldn't be fixed by normal update/upgrade or mirror change.

  I've patched my system for now with:

  sudo apt install --allow-downgrades
  python3{,-full,-doc,-examples,-minimal}=3.12.3-0ubuntu1
  libpython3-stdlib=3.12.3-0ubuntu1

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