Public bug reported:

On focal 20.04  I executed the following commands:

sudo apt-get update
sudo apt-get upgrade -y
sudo apt-get install update-manager-core -y
sudo apt-get dist-upgrade -y
sudo apt-get autoremove

also I disabled 3rd party repositories (Google, FreeCad and some other) 
 in /etc/apt/sources.list.d/ 

Checking the version I have
uname -mrs
  > Linux 5.13.0-40-generic x86_64
lsb_release -a
  >   No LSB modules are available.
       Distributor ID:    Ubuntu
       Description:    Ubuntu 20.04.4 LTS
       Release:    20.04
       Codename:    focal

Then I run the following command to execute the distribution upgrade
procedure

sudo do-release-upgrade -d

  And deep down into the process  (95%)  I hit the following "bug" 
...
Installing new version of config file 
/etc/xdg/autostart/org.gnome.Evolution-alarm-notify.desktop ...
Processing triggers for dbus (1.12.20-2ubuntu4) ...
Processing triggers for libc-bin (2.35-0ubuntu3) ...
Reading package lists... Done    
Building dependency tree          
Reading state information... Done

Calculating the changes

Calculating the changes

Traceback (most recent call last):
  File "/tmp/ubuntu-release-upgrader-ql9_ymmz/jammy", line 8, in <module>
    sys.exit(main())
  File "/tmp/ubuntu-release-upgrader-ql9_ymmz/DistUpgrade/DistUpgradeMain.py", 
line 241, in main
    if app.run():
  File 
"/tmp/ubuntu-release-upgrader-ql9_ymmz/DistUpgrade/DistUpgradeController.py", 
line 2038, in run
    return self.fullUpgrade()
  File 
"/tmp/ubuntu-release-upgrader-ql9_ymmz/DistUpgrade/DistUpgradeController.py", 
line 1992, in fullUpgrade
    if not self.calcDistUpgrade():
  File 
"/tmp/ubuntu-release-upgrader-ql9_ymmz/DistUpgrade/DistUpgradeController.py", 
line 1101, in calcDistUpgrade
    if not self.cache.installTasks(self.tasks):
AttributeError: 'DistUpgradeController' object has no attribute 'tasks'
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
Traceback (most recent call last):
  File "/tmp/ubuntu-release-upgrader-ql9_ymmz/jammy", line 8, in <module>
    sys.exit(main())
  File "/tmp/ubuntu-release-upgrader-ql9_ymmz/DistUpgrade/DistUpgradeMain.py", 
line 241, in main
    if app.run():
  File 
"/tmp/ubuntu-release-upgrader-ql9_ymmz/DistUpgrade/DistUpgradeController.py", 
line 2038, in run
    return self.fullUpgrade()
  File 
"/tmp/ubuntu-release-upgrader-ql9_ymmz/DistUpgrade/DistUpgradeController.py", 
line 1992, in fullUpgrade
    if not self.calcDistUpgrade():
  File 
"/tmp/ubuntu-release-upgrader-ql9_ymmz/DistUpgrade/DistUpgradeController.py", 
line 1101, in calcDistUpgrade
    if not self.cache.installTasks(self.tasks):
AttributeError: 'DistUpgradeController' object has no attribute 'tasks'

   I have to admit of this is really a but or if it is "self-made" that
I broke the python installation myself as I see that is using python38
from my system.

  I haven' t rebooted the computer ... The computer is "functional" but many 
Apps (file browser, LibreOffice to mention 2) have disappeared. I am scared 
that if I reboot I am going to be left without notebook to work with.
  Any guidance to get out of this issue would be much appreciated. 

Thank you for reading.

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


** Tags: dist-upgrade jammy

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https://bugs.launchpad.net/bugs/1969786

Title:
  Upgrade from 20.04 to 22.04 failed

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