Thanks for your report.
You have package from non-official repositories installed which are
blocking the upgrade.
In particular python3.6:
libpython3.6 3.6.3-1+xenial2 LP-PPA-thomas-schiex-blender
libpython3.6-minimal 3.6.3-1+xenial2 LP-PPA-thomas-schiex-blender
libpython3.6-stdlib 3.6.3-1+xenial2 LP-PPA-thomas-schiex-blender
which is not in Xenial.
Please uninstall these packages before upgrading again or revert to a
version from the official Ubuntu repository.
I'm closing this report. Don't hesitate to file any bug you may find.
** Changed in: ubuntu-release-upgrader (Ubuntu)
Status: New => Invalid
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https://bugs.launchpad.net/bugs/1763747
Title:
Cannot upgrade from 16.04.4 to 18.10
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