restore your 2fa wallet from seed, don't set a password so that it doesn't encrypt the xprvs and then view the wallet file in nano, vi, or some other text editor. then restore your multisig wallet using those xprvs. file > new/restore, enter a meaningful name like multisig-restore-20171031, wallet type multisig, select the number of cosigners (2?) and the number of sigs (1?), then for each cosigner select use public or private keys and enter the xprv one at a time. after that you should be able to spend your bitcoins to another wallet of your choice. for example a new standard electrum wallet (file>new/restore again).
I tried to follow these instructions but have got things wrong somehow....there are no btc shown, and if I try to load a transaction made on the old 2.6.4 linux wallet which has the btc - it is unrelated.
None of the xpriv or xpub keys matched any of those identified previously. Perhaps I still haven't made it clear in my explanations which wallet is which....
What I just did:
1.. On Mac,restored the original wallet from seed, found wallet, viewed and copied x1 (bip32) xprv & xpub, x2 (bip32) xpvi & xpub, x3 (bip32) xpub
2... On Linux,using latest version, restored wallet named 'multisig-restore-20171031' using 2 cosigs/1 sig entered x1 and x2 xprv keys (from step 1)
I'm now looking at all the wallets again and trying to match up meaningful pairs of keys again