[Bug 2067071] Re: cannot upgrade from 23.10 to 24.04, error in _install_t64_replacement_packages

[Nick Rosbrook]

** Tags added: rls-nn-incoming

** Changed in: ubuntu-release-upgrader (Ubuntu)
   Importance: Undecided => High

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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

Status in ubuntu-release-upgrader package in Ubuntu:
  Confirmed

Bug description:
  it crashes while calculating space - cannot proceed to package
  downloading.

  short from the logs:

  File "/tmp/ubuntu-release-upgrader-4lhpwkx7/DistUpgrade/DistUpgradeCache.py", line 497, in pre_upgrade_rule
      self.quirks.run("PreDistUpgradeCache")
    File "/tmp/ubuntu-release-upgrader-4lhpwkx7/DistUpgrade/DistUpgradeQuirks.py", line 95, in run
      func()
    File "/tmp/ubuntu-release-upgrader-4lhpwkx7/DistUpgrade/DistUpgradeQuirks.py", line 191, in PreDistUpgradeCache
      self._install_t64_replacement_packages()
    File "/tmp/ubuntu-release-upgrader-4lhpwkx7/DistUpgrade/DistUpgradeQuirks.py", line 1845, in _install_t64_replacement_packages
      if replacement.candidate._cand != ver:
         ^^^^^^^^^^^^^^^^^^^^^^^^^^^
  AttributeError: 'NoneType' object has no attribute '_cand'

  
  full logs attached as files.

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