Ever since the discovering and unearthing of the Knossos Palace in Northern Crete over 100 years ago, Archaeology and History have learned a great deal about "The Minoans"-(or Ancient Cretans). However, we are still unsure as to what their ethnicity was. The Linear A tablets are still a cryptic challenge for the most advanced Linguists and we are still unsure as to the ethnic origins of the Ancient Cretans. Could the Ancient Cretans have been a distant Pre-Mycenaean Greek civilization, a greater Egyptian civilization who ventured beyond the Nile Valley or perhaps a civilization and people who were lost to history due to the massive Tsunami which destroyed up to 80% of the island's native population 3600 years ago?
An analysis of DNA evidence, published in Nature back in 2013, suggested that the Minoans were a local European civilisation. A few reports since have refined the details, but the main conclusion still seems to be accepted.
The very latest published research that I've found (in the latest issue of Nature, dated today - 10 August 2017) shows that the Minoans and Mycenaeans were genetically very similar, having at least three-quarters of their ancestry from the earliest Neolithic farmers of western Anatolia and the Aegean.
The main difference between the Mycenaeans and the Minoans seems to be that the Mycenaeans
"derived additional ancestry from a more distant source related to the hunter–gatherers of eastern Europe and Siberia".