Same issue here... LTC to bitcoin Electrum
I followed nerioseole's instructions to the t and am unable to successfully get past step 5...
After entering the seed words for my old 2fa wallet as described in step 4, there is no "DISABLE 2fa" option. Instead, it only allows for:
"Extend this seed with custom words" OR
"BIP39 seed"
If I proceed with the BIP39 seed and create the new wallet (no password etc.) and open up that new wallet file with TextEdit, there is only a single xprv and xpub key, not x1-x3... which obviously will not work for the Electrum-LTC multi-signature wallet. Note: I am using Electrum 3.0.3
Thanks for ahead for any help here!
Are you using a 2FA wallet? (And is your address starting with a 3 or a 1?)
If you are, try again but this time choose "Wallet with two-factor authentication" instead of "Standard Wallet" when restoring your wallet seed.
If you are not, then this method won't work for you. In this case, go to Electrum-LTC and choose: Standard Wallet -> Use public or private keys -> Paste your xprv.