You have installed packages from the ubuntu-toolchain test PPA and that
is preventing the upgrader from calculating the upgrade as there are
packages installed greater than the version in 18.04. Please use ppa-
purge to remove that PPA and then try the upgrade again.
** Changed in: ubuntu-release-upgrader (Ubuntu)
Status: New => Invalid
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https://bugs.launchpad.net/bugs/1775883
Title:
Failed to upgrade 16.04.4 to 18.04. Process aborted
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