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The issue you're facing is likely due to the tutorial being outdated. OpenStack's installation methods and tools evolve rapidly, and what was valid in 2015 may not apply today. For a single-machine OpenStack deployment, I recommend looking into DevStack or MicroStack, which are more suited to your needs. MicroStack, in particular, is a snap package and offers a straightforward installation process suitable for understanding OpenStack's workings on a small scale. Try checking the official OpenStack...