which private key to export from electrum? I have an electrum 2FA wallet. 

When I list my addresses I get a list of around 30 addresses. (commnand below)

electrum -w /path/to/my/wallet/file/default1 listaddresses


Then I use the below command to obtain private keys from a particular address:

electrum getprivatekeys -w /path/to/my/wallet/file/default1 "myaddress"


Which private key is the one that I should get, so that I can import it to bitcoin-qt wallet? Is this even the right approach?

I tried first two of mentioned 27 addresses but none of them worked.

UPDATE:

Also when I export my master private key from electrum:

electrum getmasterprivate -w /home/path/to/my/wallet


However, I get Invalid private key encoding (code -5) error from bitcoin-qt when trying to import my master private key.( into bitcoin gold core wallet)

UPDATE 2:

I tried to get private keys from all (27)addresses and then run this command to import them all:

importprivkey  L3285rshf9LgkMfaNogEARoJpGhGVMMKd1dQgRgrtGd7EQ8F4qW '' false
importprivkey  L3285rshf9LgkMfaNogEARoJpGhGVMMKd1dQgRgrtGd7EQ8F4qW '' false
importprivkey  L3285rshf9LgkMfaNogEARoJpGhGVMMKd1dQgRgrtGd7EQ8F4qW '' true


output of command was 'null', yet my coins were not imported. Balance is still zero.
here is very detailed tutorial on how to salvage your bitcoin gold coins from 2FA electrum wallet.