[Bug 1969786] Re: Upgrade from 20.04 to 22.04 failed: AttributeError: 'DistUpgradeController' object has no attribute 'tasks'
Ryo Onodera
1969786 at bugs.launchpad.net
Fri Jun 6 14:03:43 UTC 2025
Also, `debootstrap`-ing `focal` and installing `nsight-systems:amd64`
didn't trigger the bug, correctly marking the package as `MarkDelete`.
```
MarkInstall libc6:amd64 < 2.31-0ubuntu9.18 -> 2.35-0ubuntu3.10 @ii umU Ib > FU=1
MarkInstall locales:amd64 < 2.31-0ubuntu9.18 -> 2.35-0ubuntu3.10 @ii umU Ib > FU=0
Installing libc-bin as Depends of locales
MarkInstall libc-bin:amd64 < 2.31-0ubuntu9.18 -> 2.35-0ubuntu3.10 @ii umU > FU=0
new important dependency: libnss-nis:amd64
Installing libnss-nis as Recommends of libc6
MarkInstall libnss-nis:amd64 < none -> 3.1-0ubuntu6 @un uN Ib > FU=0
Installing libnsl2 as Depends of libnss-nis
MarkInstall libnsl2:amd64 < none -> 1.3.0-2build2 @un uN Ib > FU=0
Installing libtirpc3 as Depends of libnsl2
MarkInstall libtirpc3:amd64 < none -> 1.3.2-2ubuntu0.1 @un uN Ib > FU=0
Installing libtirpc-common as Depends of libtirpc3
MarkInstall libtirpc-common:amd64 < none -> 1.3.2-2ubuntu0.1 @un uN > FU=0
new important dependency: libnss-nisplus:amd64
Installing libnss-nisplus as Recommends of libc6
MarkInstall libnss-nisplus:amd64 < none -> 1.3-0ubuntu6 @un uN > FU=0
Starting pkgProblemResolver with broken count: 1
Starting 2 pkgProblemResolver with broken count: 1
Investigating (0) nsight-systems:amd64 < 10.1.243-3 -> 2021.3.3.2~11.5.1-1ubuntu1 @ii umU Ib >
Broken nsight-systems:amd64 Depends on libjs-sphinxdoc:amd64 < none | 4.3.2-1 @un uH >
Considering libjs-sphinxdoc:amd64 1 as a solution to nsight-systems:amd64 0
MarkKeep nsight-systems:amd64 < 10.1.243-3 -> 2021.3.3.2~11.5.1-1ubuntu1 @ii umU Ib > FU=0
Re-Instated libjs-sphinxdoc:amd64
Reinst Failed early because of libnvidia-compute-495:amd64
Reinst Failed early because of libnvidia-compute-495-server:amd64
Reinst Failed early because of libcuda.so.1:amd64
Reinst Failed early because of libcuda-11.5-1:amd64
MarkKeep nsight-systems-target:amd64 < none -> 2021.3.3.2~11.5.1-1ubuntu1 @un uN Ib > FU=0
Reinst Failed because of nsight-systems-target:amd64
MarkKeep nsight-systems:amd64 < 10.1.243-3 -> 2021.3.3.2~11.5.1-1ubuntu1 @ii umU Ib > FU=0
Removing nsight-systems:amd64 rather than change libjs-sphinxdoc:amd64
MarkDelete nsight-systems:amd64 < 10.1.243-3 | 2021.3.3.2~11.5.1-1ubuntu1 @ii umH Ib > FU=0
Done
```
--
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https://bugs.launchpad.net/bugs/1969786
Title:
Upgrade from 20.04 to 22.04 failed: AttributeError:
'DistUpgradeController' object has no attribute 'tasks'
Status in ubuntu-release-upgrader package in Ubuntu:
Fix Released
Status in ubuntu-release-upgrader source package in Jammy:
Triaged
Bug description:
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.
---
ProblemType: Bug
ApportVersion: 2.20.11-0ubuntu27.23
Architecture: amd64
CasperMD5CheckResult: skip
CrashDB: ubuntu
CrashReports:
640:1000:125:3187472:2022-04-21 11:52:05.895499130 +0100:2022-04-21 11:52:04.499463693 +0100:/var/crash/_usr_libexec_tracker-extract.1000.crash
640:0:125:55315:2022-04-21 11:57:28.128352842 +0100:2022-04-21 11:57:28.120352608 +0100:/var/crash/_usr_bin_do-release-upgrade.0.crash
CurrentDesktop: ubuntu:GNOME
DistroRelease: Ubuntu 20.04
InstallationDate: Installed on 2020-12-22 (484 days ago)
InstallationMedia: Ubuntu 20.04.1 LTS "Focal Fossa" - Release amd64 (20200731)
Package: ubuntu-release-upgrader (not installed)
ProcVersionSignature: Ubuntu 5.13.0-40.45~20.04.1-generic 5.13.19
Tags: focal wayland-session dist-upgrade
Uname: Linux 5.13.0-40-generic x86_64
UpgradeStatus: Upgraded to focal on 2022-04-21 (0 days ago)
UserGroups: adm cdrom dip lpadmin lxd plugdev sambashare sudo
VarLogDistupgradeAptclonesystemstate.tar.gz: Error: command ['cat', '/var/log/dist-upgrade/apt-clone_system_state.tar.gz'] failed with exit code 1: cat: /var/log/dist-upgrade/apt-clone_system_state.tar.gz: Permission denied
_MarkForUpload: True
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