I just raised a bug (https://bugs.launchpad.net/ubuntu/+source/ubuntu-
release-upgrader/+bug/1947121) which might be similar to this one.
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https://bugs.launchpad.net/bugs/1767501
Title:
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/1767
** Tags removed: rls-bb-incoming
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https://bugs.launchpad.net/bugs/1767501
Title:
do-release-upgrade leaves the system in a unbootable state
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** Tags added: third-party-packages
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https://bugs.launchpad.net/bugs/1767501
Title:
do-release-upgrade leaves the system in a unbootable state
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** Tags added: rls-bb-incoming
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https://bugs.launchpad.net/bugs/1767501
Title:
do-release-upgrade leaves the system in a unbootable state
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** Tags added: artful2bionic
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https://bugs.launchpad.net/bugs/1767501
Title:
do-release-upgrade leaves the system in a unbootable state
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ht