The error is:
"ERROR Dist-upgrade failed: 'E:Error, pkgProblemResolver::Resolve
generated breaks, this may be caused by held packages.'"
"unresolvable problem" means nothing, too 'generic' output. But "held
packages" means a lot.
So downgrade to genuine version (from ppa's packages) then clean the
system via 'gtkorphan' & bleachbit (as root, but carefully select
options).
Then dist-upgrade should be happier.
** Changed in: ubuntu-release-upgrader (Ubuntu)
Status: Confirmed => Incomplete
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https://bugs.launchpad.net/bugs/1767713
Title:
Cannot upgrade from Ubuntu 16.04 to Ubuntu 18.04
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