Upgrade from 20.04 to 22.04 failed: AttributeError: 'DistUpgradeController' object has no attribute 'tasks'

Hi,

If your system is still in this state, can you run `apport-collect 1969786` so we can see the upgrade log files?

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Thanks, Alex.

Looking at VarLogDistupgradeMainlog.txt, I can see that need_server_mode() is returning true the third time it's called, and this leads to DistUpgradeController.calcDistUpgrade trying to read DistUpgradeController.tasks later on. But, DistUpgradeController.tasks would only be assigned if need_server_mode() had been true much earlier in the process.

That piece should be easy to fix, but I think the real issue is that 'ubuntu-desktop' is ostensibly not installed at that phase.

Are you referring to this line?

DEBUG need_server_mode(): can not find a desktop meta package or key deps, running in server mode

  I don't understand this ... It is a laptop that only has a SSH server active on (to be able to do SCP secure copy from the other CentOS box). Why it doesn' t have this "desktop meta package"?
  How do I install this "desktop meta package"?
  How do I go to install "ubuntu-desktop" then ? Because I only need desktop on my notebook, I certainly don't need server.

Shall I run
do-release-upgrade -d --mode=desktop ?
shall I use the "--proposed" option?

> Are you referring to this line?

Yes, that is the line I was referring to.

> I don't understand this ...

Yeah, I think this is the real bug, the ubuntu-desktop meta package was removed during your upgrade (according to VarLogDistupgradeApttermlog.txt). You can try installing it again with `sudo apt install ubuntu-desktop`.

I managed to sort it out ... After a scare. I lock the desktop and I was unable to log back in. Upon rebooting I would only get a text prompt and no network connection after login.
  Somehow I managed to get the ethernet up and running. Then with apt upgrade and apt install ubuntu-desktop... I have a flashy new desktop.
  I must say ... I was very impressed how the apt command gave me the option to see diffs in some config and policy files in ImageMagick, ssh_config and few others that I had forgotten about. Very impressed with that feature.

Status changed to 'Confirmed' because the bug affects multiple users.

Hello,
I was at the same point, but i accidently cancelled the process. After reboot load into the grub boot-menu.When i choose ubuntu as bootoption it is stuck in the boot. What shall i do or where should I ask?

Status changed to 'Confirmed' because the bug affects multiple users.

I encountered this bug while upgrading from Xubuntu 20.04. After the upgrader failed I ran it a second time and it was able to complete successfully. However, after rebooting, most of the desktop packages were missing. I had to install netplan, xubuntu-desktop, lightdm, gnome-polkit-agent, and maybe a few other things in order to have a working system. It is as if the upgrader thought my system was a server install?

My system was initially installed as Xubuntu 18.04, upgraded to 20.04, and then upgraded to 22.04.

Logs from the first upgrader run are on duplicate bug 1985966.

@a-j-buxton I encountered the same problem. Do you now have a working system? How have you indentified which packages to reinstall after rebooting?

@giammi56 Some people reported how they fixed their system post-crash in this duplicate issue:
https://bugs.launchpad.net/ubuntu/+source/ubuntu-release-upgrader/+bug/1986346

Idk if it is relevant, but I also had upgraded through multiple versions, starting with 16 I think.

I think this should be considered a relatively serious bug as it left me with an unbootable system, having to boot from USB, do some mounts and a chroot to get the luks/lvm boot working again. Luckily I had a spare computer to research this and create a suitable usb key, but this wouldn't be the case for all, even if they were confident enough to try that sort of thing.

Once it came back, because gnome was gone, the network was also non functional, which is another large barrier to recovering the system.

This bug was fixed in the package ubuntu-release-upgrader - 1:22.10.7

---------------
ubuntu-release-upgrader (1:22.10.7) kinetic; urgency=medium

  * DistUpgrade/DistUpgradeController.py: In one of the final calls of
    need_server_mode() do not allow switching from a desktop mode upgrade to a
    server mode upgrade. (LP: #1969786)
  * data/release-upgrades: set Prompt to normal
  * Run pre-build.sh: updating mirrors, demotions, and translations.

 -- Brian Murray <email address hidden> Mon, 22 Aug 2022 12:56:34 -0700

I still have the same problem, although it happens way earlier during the updating process:

----------------------------------------
Calculating the changes

Traceback (most recent call last):
  File "/tmp/ubuntu-release-upgrader-0fysul7a/jammy", line 8, in <module>
    sys.exit(main())
  File "/tmp/ubuntu-release-upgrader-0fysul7a/DistUpgrade/DistUpgradeMain.py", line 241, in main
    if app.run():
  File "/tmp/ubuntu-release-upgrader-0fysul7a/DistUpgrade/DistUpgradeController.py", line 2042, in run
    return self.fullUpgrade()
  File "/tmp/ubuntu-release-upgrader-0fysul7a/DistUpgrade/DistUpgradeController.py", line 1991, in fullUpgrade
    if not self.calcDistUpgrade():
  File "/tmp/ubuntu-release-upgrader-0fysul7a/DistUpgrade/DistUpgradeController.py", line 1100, 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

Original exception was:
Traceback (most recent call last):
  File "/tmp/ubuntu-release-upgrader-0fysul7a/jammy", line 8, in <module>
    sys.exit(main())
  File "/tmp/ubuntu-release-upgrader-0fysul7a/DistUpgrade/DistUpgradeMain.py", line 241, in main
    if app.run():
  File "/tmp/ubuntu-release-upgrader-0fysul7a/DistUpgrade/DistUpgradeController.py", line 2042, in run
    return self.fullUpgrade()
  File "/tmp/ubuntu-release-upgrader-0fysul7a/DistUpgrade/DistUpgradeController.py", line 1991, in fullUpgrade
    if not self.calcDistUpgrade():
  File "/tmp/ubuntu-release-upgrader-0fysul7a/DistUpgrade/DistUpgradeController.py", line 1100, in calcDistUpgrade
    if not self.cache.installTasks(self.tasks):
AttributeError: 'DistUpgradeController' object has no attribute 'tasks'
=== Command detached from window (Wed Sep 21 08:56:43 2022) ===

I have a fix for this bug which should work, however we are missing a test case for verifying that the fix in fact worked. What we could use at this point in time are log files from people trying to upgrade and failing. The easiest way to send those in would be to open a new bug report using 'ubuntu-bug ubuntu-release-upgrader' after a failed upgrade attempt. Alternatively, the file 'apt-clone_system_state.tar.gz' in /var/log/dist-upgrade/ might be enough.

Brian, see ubuntu-release-upgrader bug 1990308 (was marked as a duplicate of this one)

Brian, here you can find the full requested log of the failed update. Inside the tar.gz there are apt.log and main.log

I have the same problem on upgrading 20.04 to 22.04

release-upgrader version '22.04.15'

Brian, I've attached the /var/log/dist-upgrade logs:
apt.log
apt-term.log
history.log
main.log

Let me know if you need anything else.

From main.log:
----------------------------------------------------
2023-03-02 15:52:37,810 ERROR not handled exception:
Traceback (most recent call last):

  File "/tmp/ubuntu-release-upgrader-mowqr6lm/jammy", line 8, in <module>
    sys.exit(main())

  File "/tmp/ubuntu-release-upgrader-mowqr6lm/DistUpgrade/DistUpgradeMain.py", line 241, in main
    if app.run():

  File "/tmp/ubuntu-release-upgrader-mowqr6lm/DistUpgrade/DistUpgradeController.py", line 2042, in run
    return self.fullUpgrade()

  File "/tmp/ubuntu-release-upgrader-mowqr6lm/DistUpgrade/DistUpgradeController.py", line 1991, in fullUpgrade
    if not self.calcDistUpgrade():

  File "/tmp/ubuntu-release-upgrader-mowqr6lm/DistUpgrade/DistUpgradeController.py", line 1100, in calcDistUpgrade
    if not self.cache.installTasks(self.tasks):

AttributeError: 'DistUpgradeController' object has no attribute 'tasks'

2023-03-02 15:52:37,810 DEBUG running apport_crash()

Just hit this bug today while upgrading from xubuntu 20.04 to 22.04.

After some digging into logs, I may have found why it switched from desktop to server mid-upgrade:

```
Investigating (3) xubuntu-core:amd64 < 2.233 | 2.241 @ii umH Ib >
Broken xubuntu-core:amd64 Dépend on lightdm:amd64 < 1.30.0-0ubuntu4~20.04.2 | 1.30.0-0ubuntu5 @ii umR >
  Considering lightdm:amd64 607 as a solution to xubuntu-core:amd64 -1
    Reinst Failed because of lightdm:amd64
  MarkKeep xubuntu-core:amd64 < 2.233 -> 2.241 @ii umU Ib > FU=0
  Removing xubuntu-core:amd64 rather than change lightdm:amd64
  Setting alsa-base:amd64 NOT as auto-installed (direct Dépend of xubuntu-core:amd64 which is in APT::Never-MarkAuto-Sections)
  [...]
  Setting xubuntu-docs:amd64 NOT as auto-installed (direct Recommande of xubuntu-core:amd64 which is in APT::Never-MarkAuto-Sections)
  MarkDelete xubuntu-core:amd64 < 2.233 | 2.241 @ii umH Ib > FU=0
```

It seems to be a problem with apt resolution which decided to remove xubuntu-core.
The python crash due to switching to server mode seems to only be a side-effect...

I tried to install xubuntu-core again using apt, I got no resolution error, and now I'm finishing the upgrade manually `apt-get dist-upgrade`, it seems to work!

Just happend to me upgrading from kubuntu 20.04 to 22.04