28th October 2016, 18:37
From what I read its either you have set a password in Mint 17.3 and since the encryption scheme has changed, that might be the problem. I dont know if you can simply reset / remove your current wallet and start a new one in your current system.
Otherwise, have you tried entering NO (aka "blank") password at all and just click continue?
Otherwise, have you tried entering NO (aka "blank") password at all and just click continue?