You only get "x2/" if you restore your wallet and then "Disable" 2fa so that it puts both xprvs into your wallet...

If you restore and "keep" the 2FA then you only get one xprv...

To be honest, I still think you're trying to retrieve the wrong keys... All these two xprvs will let you do is spend from your 2FA wallet without needing TrustedCoin.

But you're trying to spend from an unrelated MultiSig from your Linux wallet.