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[Launchpad Bug Tracker <1860606@xxxxxxxxxxxxxxxxxx>]

This bug was fixed in the package python-apt - 1.9.5

---------------
python-apt (1.9.5) experimental; urgency=medium

  [ Marc Deslauriers ]
  * SECURITY REGRESSION: crash with ubuntu-release-upgrader (LP: #1860606)
    - apt/cache.py: make allow_unauthenticated argument to
      fetch_archives() optional.

  [ Julian Andres Klode ]
  * Really bump aptdaemon break (to 1.1.1+bzr982-0ubuntu31)

 -- Julian Andres Klode <jak@xxxxxxxxxx>  Thu, 23 Jan 2020 10:55:46
+0100

** Changed in: python-apt (Ubuntu Focal)
       Status: Confirmed => Fix Released

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

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

Status in python-apt package in Ubuntu:
  Fix Released
Status in python-apt source package in Xenial:
  Fix Released
Status in python-apt source package in Bionic:
  Fix Released
Status in python-apt source package in Disco:
  Fix Released
Status in python-apt source package in Eoan:
  Fix Released
Status in python-apt source package in Focal:
  Fix Released

Bug description:
  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'

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