This is in part due to the ubuntu-toolchain PPA you have enabled and
installed packages from. Please use the tool 'ppa-purge' from the
package 'ppa-purge' to disable that PPA and downgrade to the official
Ubuntu versions of the packages provided by that PPA. After that you can
try the upgrade again.

** Changed in: ubuntu-release-upgrader (Ubuntu)
       Status: New => Incomplete

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https://bugs.launchpad.net/bugs/1784990

Title:
  Release upgrader crashes while upgrading from 16.04LTS to 18.04 LTS

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