Now there is a failure due to the xorg PPA you are using.
deb http://ppa.launchpad.net/oibaf/graphics-drivers/ubuntu xenial main
Please also remove that PPA using ppa-purge and try the upgrade again.
Thanks!
** Changed in: ubuntu-release-upgrader (Ubuntu)
Status: New => Incomplete
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https://bugs.launchpad.net/bugs/1787579
Title:
Cant update Kubuntu 16.04 to 18.04 updater crashes displaying "could
not calculate the update"
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