This bug was fixed in the package ubuntu-release-upgrader - 1:20.04.17
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ubuntu-release-upgrader (1:20.04.17) focal; urgency=medium
* DistUpgrade/DistUpgradeFetcher.py,
DistUpgrade/ReleaseNotesViewerWebkit.py: use gi.require_version so that
the right version gets loaded an
check-new-release-gtk didn't exit because of the PyGIWarning rather it
was because of a failure to get the meta-release information from
changelogs.ubuntu.com. However, because this warning message is
confusing I'll go ahead and fix this and use this bug for that issue.
** Changed in: ubuntu-relea
This bug has been reported on the Ubuntu ISO testing tracker.
A list of all reports related to this bug can be found here:
http://iso.qa.ubuntu.com/qatracker/reports/bugs/1848629
** Tags added: iso-testing
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This is working using Ubuntu MATE 18.04 and upgrading to Ubuntu MATE
20.04
However I do get this error message in the terminal:
Checking for a new Ubuntu release
/usr/lib/python3/dist-packages/DistUpgrade/DistUpgradeFetcher.py:23:
PyGIWarning: Gtk was imported without specifying a version first.
Status changed to 'Confirmed' because the bug affects multiple users.
** Changed in: ubuntu-release-upgrader (Ubuntu)
Status: New => Confirmed
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https://bugs.launchpad.net/bugs/1848