Public bug reported:
While attempting an upgrade to the Ubuntu 26.04 "Resolute Raccoon"
development branch using do-release-upgrade -d, the process fails
immediately after downloading the upgrader tarball due to a Python
ImportError.
Steps to reproduce:
Run sudo do-release-upgrade -d on an Ubuntu 25.10 system.
The upgrader downloads the "resolute" tarball to /tmp.
The process crashes before the UI initializes.
Expected Behavior:
The upgrader should initialize and begin the "Calculating Changes" phase.
Actual Behavior:
A Traceback occurs because DistUpgradeController.py attempts to import
inhibit_sleep from DistUpgrade.utils, but that function is missing from the
utils.py file in the current Resolute archive.
Traceback (most recent call last):
File "/tmp/ubuntu-release-upgrader-XXXXXX/resolute", line 8, in <module>
sys.exit(main())
File "/tmp/ubuntu-release-upgrader-XXXXXX/DistUpgrade/DistUpgradeMain.py",
line 222, in main
from .DistUpgradeController import DistUpgradeController
File
"/tmp/ubuntu-release-upgrader-XXXXXX/DistUpgrade/DistUpgradeController.py",
line 43, in <module>
from .utils import (..., inhibit_sleep)
ImportError: cannot import name 'inhibit_sleep' from 'DistUpgrade.utils'
** Affects: ubuntu-release-upgrader (Ubuntu)
Importance: Undecided
Status: New
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https://bugs.launchpad.net/bugs/2141637
Title:
ImportError: cannot import name 'inhibit_sleep' from
'DistUpgrade.utils' during 25.10 to 26.04 upgrade
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