[Merge] lp:~xnox/ubuntu-release-upgrader/lp1749199 into lp:ubuntu-release-upgrader

[Brian Murray]

Review: Needs Fixing

This looks fine but the PurgeObsoletes changes should also be made in DistUpgrade.cfg.xenial particularly because the bug is about an upgrade from Xenial to Bionic.
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https://code.launchpad.net/~xnox/ubuntu-release-upgrader/lp1749199/+merge/341342
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