Run into the same problem upgrading 23.10 to 24.04.

I run do-release-upgrade. Checking /var/log/dist-upgrade/main.log, I
could see that the problem was:


    2024-06-14 21:00:38,539 DEBUG Searching for replacement for libts0
    2024-06-14 21:00:38,562 ERROR not handled exception:
    ...
      File 
"/tmp/ubuntu-release-upgrader-t3r65jm_/DistUpgrade/DistUpgradeQuirks.py", line 
1845, in _install_t64_replacement_packages
        if replacement.candidate._cand != ver:
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^

    AttributeError: 'NoneType' object has no attribute '_cand'


Replaced libts0:1.22.1 with libts0t64 1.22.1-1build1 instead of removing it, 
and this allowed me to proceed with the upgrade.

It hasn't completed yet, I don't know whether I'll find something else.

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https://bugs.launchpad.net/bugs/2067071

Title:
  cannot upgrade from 23.10 to 24.04, error in
  _install_t64_replacement_packages

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