Thank you for taking the time to report this bug and helping to make
Ubuntu better. The error that you are a reporting is a package conflict
between a package from the official Ubuntu archive and a package from
the ubuntu-toolchain-r test PPA. To resolve this situation please
uninstall the packages from that PPA using the tool 'ppa-purge' which is
provided by the ppa-purge package. Then try performing the distribution
upgrade operations again. Thanks in advance!
** Changed in: ubuntu-release-upgrader (Ubuntu)
Status: New => Invalid
** Tags added: ppa-conflict ubuntu-toolchain-r
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https://bugs.launchpad.net/bugs/1791144
Title:
unable to upgrade from 16.04 to 18.04
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