Comment 65 for bug 1560797

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Brian Murray (brian-murray) wrote :

If /usr/lib/ubuntu-release-upgrader/check-new-release-gtk is used, which is called by the update-notifier release upgrade notification, the upgrade can start without first upgrading the system (because update-manager is by passed). It is possible to make ubuntu-release-upgrader require certain packages be installed before starting the release upgrade and it seems like we should require the new version of apt.