Public bug reported:

I was upgrading my workstation from 19.04 to 19.10 and following that to
20.04. In each case I used do-release-upgrade (without and with -d
respectively). The 20.04 upgrade failed as the tool crashed on invalid
function signature:

Original exception was:
Traceback (most recent call last):
  File "/tmp/ubuntu-release-upgrader-f_816ncr/focal", line 8, in <module>
    sys.exit(main())
  File "/tmp/ubuntu-release-upgrader-f_816ncr/DistUpgrade/DistUpgradeMain.py", 
line 238, in main
    if app.run():
  File 
"/tmp/ubuntu-release-upgrader-f_816ncr/DistUpgrade/DistUpgradeController.py", 
line 2082, in run
    return self.fullUpgrade()
  File 
"/tmp/ubuntu-release-upgrader-f_816ncr/DistUpgrade/DistUpgradeController.py", 
line 1998, in fullUpgrade
    if not self.doDistUpgradeFetching():
  File 
"/tmp/ubuntu-release-upgrader-f_816ncr/DistUpgrade/DistUpgradeController.py", 
line 1233, in doDistUpgradeFetching
    self.cache._fetch_archives(self.fetcher, pm)
TypeError: _fetch_archives() missing 1 required positional argument: 
'allow_unauthenticated'

** Affects: ubuntu-release-upgrader (Ubuntu)
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/1860606

Title:
  TypeError: _fetch_archives() missing 1 required positional argument:
  'allow_unauthenticated'

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