This is in part because of the ubuntu-toolchain-r you have enabled.
Please disable it using 'ppa-purge' from the 'ppa-purge' package and try
the upgrade again.
** Changed in: ubuntu-release-upgrader (Ubuntu)
Status: New => Incomplete
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https://bugs.launchpad.net/bugs/1786039
Title:
Upgrade from 16.04.5 to 18.04.1 crashes with message unable to resolve
upgrade
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