You have installed packages from the 'ubuntu-toolchain' ubuntu-test PPA
and that is causing a failure to upgrade. Please install the package
ppa-purge and use the tool in it called ppa-purge to remove the PPA and
downgrade to official Ubuntu package versions. This should then allow
the upgrade to proceed.
** Changed in: ubuntu-release-upgrader (Ubuntu)
Status: New => Invalid
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https://bugs.launchpad.net/bugs/1776055
Title:
Error while updating to 18.04
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