Is Somalia and example of a Libertarian utopia?
This is an unfortunate argument (attack) used against Libertarians sometimes and is completely unfounded.
Somalia is more of an anarchist state with no government and broken up into regions of different types of law based on local customs or religion. With no real organized government to use force to protect life, liberty, and property people and groups are free to use aggression on what another to enact changes. This goes against the very idea of liberty that Libertarians fight for.
If you ever hear this argument used it is by someone completely uninformed or being malicious to spread falsehoods about Libertarian principles. This is also related to the 'falsehoods' of the Libertarian 'utopia'. Please refer to the FAQ on that for further details.