Public bug reported:
While upgrading Kubuntu 18.04 to 20.04.1, the upgrader tool crashed with the
stack trace below.
I then ran apt update && apt full-upgrade manually from terminal, restarted
into a broken login screen, found out plasma is not installed, and manually
installed all packages in the distribution manifest to fix the system. It all
started with this:
Traceback (most recent call last):
File "/tmp/ubuntu-release-upgrader-snwfpw49/focal", line 8, in <module>
sys.exit(main())
File "/tmp/ubuntu-release-upgrader-snwfpw49/DistUpgrade/DistUpgradeMain.py",
line 238, in main
if app.run():
File
"/tmp/ubuntu-release-upgrader-snwfpw49/DistUpgrade/DistUpgradeController.py",
line 2089, in run
return self.fullUpgrade()
File
"/tmp/ubuntu-release-upgrader-snwfpw49/DistUpgrade/DistUpgradeController.py",
line 2048, in fullUpgrade
if not self.calcDistUpgrade():
File
"/tmp/ubuntu-release-upgrader-snwfpw49/DistUpgrade/DistUpgradeController.py",
line 1118, 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 497, in
add_to_existing
self.write(f)
File "/usr/lib/python3/dist-packages/problem_report.py", line 450, in write
block = f.read(1048576)
File "/usr/lib/python3.6/codecs.py", line 321, 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-snwfpw49/focal", line 8, in <module>
sys.exit(main())
File "/tmp/ubuntu-release-upgrader-snwfpw49/DistUpgrade/DistUpgradeMain.py",
line 238, in main
if app.run():
File
"/tmp/ubuntu-release-upgrader-snwfpw49/DistUpgrade/DistUpgradeController.py",
line 2089, in run
return self.fullUpgrade()
File
"/tmp/ubuntu-release-upgrader-snwfpw49/DistUpgrade/DistUpgradeController.py",
line 2048, in fullUpgrade
if not self.calcDistUpgrade():
File
"/tmp/ubuntu-release-upgrader-snwfpw49/DistUpgrade/DistUpgradeController.py",
line 1118, in calcDistUpgrade
if not self.cache.installTasks(self.tasks):
AttributeError: 'DistUpgradeController' object has no attribute 'tasks'
** Affects: ubuntu-release-upgrader (Ubuntu)
Importance: Undecided
Status: New
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https://bugs.launchpad.net/bugs/1900976
Title:
AttributeError: 'DistUpgradeController' object has no attribute
'tasks'
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