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. The most exotic suggestion that I have encountered is that Linear A is related to Japanese(l).
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! Gretchen Leonhardt(m) also sought a solution in the East, offering a proto-Japanese origin for the script, a theory refuted by Yurii Mosenkis(j) , who promotes Minoan Linear A as proto-Greek. Mosenkis has published a number of papers on the Academia.edu relating to Linear A(k).
Another of the many 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, even though today’s supercomputers are so far ahead of what Alan Turing had to work with, Linear A remains undecoded!
In 2018, Brent Davis, one of the leading experts on Bronze Age Aegean scripts and languages published a paper in which “based on a close statistical analysis, shows that the while both the Phaistos Disc and Linear A are undeciphered writing systems, he can demonstrate that the both are, with a high degree of certainty, encode the same language!”(i)