Thanks for your report.
You have several packages from non official ubuntu repositories which
are blocking the upgrade. In particular the Xorg stack from the padoka
PPA, ROS packages, ...
Please revert to official versions and try the upgrade again. The tool
ppa-purge may help you with that.
** Tags added: xenial2bionic
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https://bugs.launchpad.net/bugs/1772645
Title:
ubuntu is not upgrading from 16.04 LTS to 18.04 LTS
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