Linear A (1800-1450 BC) is the designation given to one of two scripts used by the Minoans. Although Linear B, which has been deciphered, is similar to Linear A, there have been many failed attempts to decipher it, variously linking it to the Greek, Etruscan, Tyrhennian, Anatolian or Persian(d) languages.
However, there is some evidence that a writing system was in use in Greece as far back as the sixth millennium BC and was not adopted from the Phoenicians(h).
Patrick Archer moved further east for a solution, claiming that Linear A is possibly related to Chinese pictographs! One of the more exotic solutions was offered by the American, Stuart Harris, who identified the language as being related to Finnish(a)(f)(g). Harris also quotes the controversial Oera Linda Book as evidence that the Cretans spoke Finnish (e). He follows Felice Vinci in identifying the Baltic as the source of much of Greek culture including Homer’s epics(b), in which connection they both locate Troy in Finland.
So far, no single translation theory has gained general acceptance.
Nevertheless, I have always been surprised that the British who managed to unravel the workings of the German Enigma Machine during World War II have failed to decipher Linear A!