[Merge] ~lamoura/update-notifier:pro-bionic-fix-release into update-notifier:bionic

[Andreas Hasenack]

I merged this, but the upload will be from the git-ubuntu repository, which represents what is in the bionic archive correctly. The upstream update-notifier bionic branch needs to be reconciled with what's in the archive.
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https://code.launchpad.net/~lamoura/update-notifier/+git/update-notifier/+merge/430598
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