It looks like you have a PPA providing graphics drivers enabled which is
causing the upgrade to fail. You should have received an error message
like the following:
details += _("This was likely caused by:\n"
" * Unofficial software packages not provided by
Ubuntu\n"
"Please use the tool 'ppa-purge' from the
ppa-purge \n"
"package to remove software from a Launchpad PPA
and \n"
"try the upgrade again.\n"
"\n")
If you use ppa-purge to remove the oibaf ubuntu graphics drivers ppa and
then try upgrading you should be good to go.
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https://bugs.launchpad.net/bugs/1824247
Title:
Upgrade from 16.04 to 18.04 fails.
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