Thank you for taking the time to report this bug and helping to make
Ubuntu better. The error that you are a reporting is a conflict between
packages from the official Ubuntu archive and packages from a PPA. To
resolve this situation please deactivate PPAs using the tool 'ppa-purge'
which is provided by the ppa-purge package. Then try performing the
release upgrade again. Thanks in advance!
** Changed in: ubuntu-release-upgrader (Ubuntu)
Status: New => Invalid
** Tags added: ppa-conflict
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Bugs, which is subscribed to Ubuntu.
https://bugs.launchpad.net/bugs/1789367
Title:
An unresolvable problem occurred while calculating the upgrade from
16.04 LTS to 18.04.1.
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