Your 'unknown' reason:
*******
Could not calculate the upgrade
An unresolvable problem occurred while calculating the upgrade.
This can be caused by:
* Upgrading to a pre-release version of Ubuntu
* Running the current pre-release version of Ubuntu
* Unofficial software packages not provided by Ubuntu <<<<< your unknown
reason
**************
So start downgrading to genuine versions, via ppa-purge; then clean the system
with autoremove, and finally update/upgrade.
Then dist-upgrading should be happier.
** Changed in: ubuntu-release-upgrader (Ubuntu)
Status: New => Incomplete
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Bugs, which is subscribed to Ubuntu.
https://bugs.launchpad.net/bugs/1769102
Title:
attempted to upgrade to 18.04 and it failed for an unknown reason
To manage notifications about this bug go to:
https://bugs.launchpad.net/ubuntu/+source/ubuntu-release-upgrader/+bug/1769102/+subscriptions
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