This is due in part to the ubuntu-toolchain test ppa you have enabled
and installed packages from. You'll need to us the tool ppa-purge from
the package ppa-purge to disable the PPA and downgrade the packages it
provides to the official ones from the Ubuntu archive. After you've done
this please try the upgrade again. Thanks and good luck!
** Changed in: ubuntu-release-upgrader (Ubuntu)
Status: New => Incomplete
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https://bugs.launchpad.net/bugs/1787704
Title:
sudo do-release-upgrade
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