This bug was fixed in the package update-manager - 1:26.04.4
---------------
update-manager (1:26.04.4) resolute; urgency=medium
* Almost completely revert previous change that removed inhibitor of
shutdown and sleep, but only inhibit sleep now, as a compromise between
- LP: #2133012: "Restart now" has no effect in update-manager; and
- LP: #2141637: Ubuntu-release-upgrader crashes without inhibit_sleep.
-- Nathan Pratta Teodosio <[email protected]> Thu, 12 Feb 2026
18:53:14 +0100
** Changed in: update-manager (Ubuntu)
Status: Fix Committed => Fix Released
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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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