[Bug 1901173] Re: Updating focal to groovy fails

[Mario Camou]

** Package changed: python-defaults (Ubuntu) => update-manager-core
(Ubuntu)

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https://bugs.launchpad.net/bugs/1901173

Title:
  Updating focal to groovy fails

Status in update-manager-core package in Ubuntu:
  New

Bug description:
  Running `do-release-upgrade` from focal to groovy, I got the following
  crash after the packages were downloaded:

  ```
  apt_pkg.Error: E:Could not configure 'libc6:amd64'. , E:Could not perform immediate configuration on 'libnss-nis:amd64'. Please see man 5 apt.conf under APT::Immediate-Configure for details. (2)
  Error in sys.excepthook:
  Traceback (most recent call last):
    File "/usr/lib/python3/dist-packages/problem_report.py", line 477, in add_to_existing
      self.write(f)
    File "/usr/lib/python3/dist-packages/problem_report.py", line 430, in write
      block = f.read(1048576)
    File "/usr/lib/python3.8/codecs.py", line 322, in decode
      (result, consumed) = self._buffer_decode(data, self.errors, final)
  UnicodeDecodeError: 'utf-8' codec can't decode byte 0x8b in position 1: invalid start byte

  Original exception was:
  apt_pkg.Error: E:Could not configure 'libc6:amd64'. , E:Could not perform immediate configuration on 'libnss-nis:amd64'. Please see man 5 apt.conf under APT::Immediate-Configure for details. (2)
  Error in function: install

  apt_pkg.Error: E:Could not perform immediate configuration on 'libffi8ubuntu1:amd64'. Please see man 5 apt.conf under APT::Immediate-Configure for details. (2)
  Error in sys.excepthook:
  Traceback (most recent call last):
    File "/usr/lib/python3/dist-packages/problem_report.py", line 477, in add_to_existing
      self.write(f)
    File "/usr/lib/python3/dist-packages/problem_report.py", line 430, in write
      block = f.read(1048576)
    File "/usr/lib/python3.8/codecs.py", line 322, in decode
      (result, consumed) = self._buffer_decode(data, self.errors, final)
  UnicodeDecodeError: 'utf-8' codec can't decode byte 0x8b in position 1: invalid start byte

  Original exception was:
  apt_pkg.Error: E:Could not perform immediate configuration on 'libffi8ubuntu1:amd64'. Please see man 5 apt.conf under APT::Immediate-Configure for details. (2)

  Could not install the upgrades

  The upgrade has aborted. Your system could be in an unusable state. A 
  recovery will run now (dpkg --configure -a). 

  
  Upgrade infeasible 

  The upgrade could not be completed, there were errors during the 
  upgrade process. 
  ```

  I tried adding an /etc/apt/99temp-release-upgrade file with the
  following contents:

  ```
  APT::Immediate-Configure "false"
  ```

  which resulted in:

  ```
  # do-release-upgrade 
  Traceback (most recent call last):
    File "/usr/bin/do-release-upgrade", line 11, in <module>
      from UpdateManager.Core.MetaRelease import MetaReleaseCore
    File "/usr/lib/python3/dist-packages/UpdateManager/Core/MetaRelease.py", line 25, in <module>
      import apt
    File "/usr/lib/python3/dist-packages/apt/__init__.py", line 35, in <module>
      apt_pkg.init_config()
  apt_pkg.Error: E:Syntax error /etc/apt/apt.conf.d/99temp-for-release-upgrade:3: Extra junk at end of file
  ```

  This was detected by someone during the beta, but it seems that no one
  took the time to fix it: https://bugs.launchpad.net/ubuntu/+source
  /ubuntu-release-upgrader/+bug/1899272

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