Merge pull request #737 from manics/remove_unsupported_ubuntu

Remove Ubuntu versions which aren't supported by upstream
merge dev_5_0 -D org

Repository: openmicroscopy/ome-documentation
Updating 6d9a1cc..7d83a1d
Merged PRs (fast-forward):
  # PR 737 manics 'Remove Ubuntu versions which aren't supported by upstream'

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