This is due to the fact that you have installed some packages from the
Ubuntu toolchain PPA and they provide a greater version of the package
than the one in Ubuntu 18.04, the release to which you are trying to
upgrade. Please use the tool ppa-purge to remove that PPA and downgrade
to the official
** Tags added: artful2bionic
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https://bugs.launchpad.net/bugs/1774695
Title:
Could not calculate the upgrade
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