ubuntu-release-upgrade should disable -proposed to prevent situations
like this. Please include your the file /var/log/dist-upgrade/main.log
which should contain information about your upgrade from 14.04 to 16.04.
DistUpgradeController.py contains the following code:
653 # Disable proposed on upgrade to a development release.
654 if (not entry.disabled and self.options
655 and self.options.devel_release == True and
656 "%s-proposed" % self.fromDist in entry.dist):
657 logging.debug("upgrade to development release, disabling
proposed")
658 entry.dist = "%s-proposed" % self.toDist
659 entry.comment += _("Not for humans during development
stage of release %s") % self.toDist
660 entry.disabled = True
661 continue
So you'd also see the above comment in /etc/apt/sources.list.
** Changed in: shim (Ubuntu)
Importance: Undecided => High
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https://bugs.launchpad.net/bugs/1652147
Title:
UEFI secure boot fails after 14.04 to 16.04 upgrade
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