You've installed some packages from a PPA which are causing the upgrade
to fail.
libstdc++6 5.4.0-6ubuntu1~16.04.9 0
gcc-8-base 8-20180424-0ubuntu1~14.04 1
You'll want to remove these and whatever else the PPA provides using the
tool 'ppa-purge' from the package ppa-purge. Thanks and good luck.
** Changed in: ubuntu-release-upgrader (Ubuntu)
Status: New => Invalid
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https://bugs.launchpad.net/bugs/1776940
Title:
upgrade fail from 16.04 to 18.04
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