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Cannot import private keys

See original GitHub issue

I am trying to import some private keys into the wallet, but it seems that electrum doesn’t support it. Here is what it tried:

[root@v48807 .bitcoin]# electrum version
3.3.4
[root@v48807 .bitcoin]# electrum importprivkey --help
usage: electrum importprivkey [-h] [-v [VERBOSITY]] [-D ELECTRUM_PATH] [-P]
                              [-w WALLET_PATH] [--testnet] [--regtest]
                              [--simnet] [-W PASSWORD]
                              privkey

Import a private key.

positional arguments:
  privkey               Private key. Type '?' to get a prompt.

optional arguments:
  -h, --help            show this help message and exit
  -W PASSWORD, --password PASSWORD
                        Password

global options:
  -v [VERBOSITY]        Set verbosity filter
  -D ELECTRUM_PATH, --dir ELECTRUM_PATH
                        electrum directory
  -P, --portable        Use local 'electrum_data' directory
  -w WALLET_PATH, --wallet WALLET_PATH
                        wallet path
  --testnet             Use Testnet
  --regtest             Use Regtest
  --simnet              Use Simnet
[root@v48807 .bitcoin]# electrum create --help
usage: electrum create [-h] [-v [VERBOSITY]] [-D ELECTRUM_PATH] [-P]
                       [-w WALLET_PATH] [--testnet] [--regtest] [--simnet]
                       [--passphrase PASSPHRASE] [-W PASSWORD]
                       [--encrypt_file ENCRYPT_FILE] [--segwit]

Create a new wallet

optional arguments:
  -h, --help            show this help message and exit
  --passphrase PASSPHRASE
                        Seed extension
  -W PASSWORD, --password PASSWORD
                        Password
  --encrypt_file ENCRYPT_FILE
                        Whether the file on disk should be encrypted with the
                        provided password
  --segwit              Create segwit seed

global options:
  -v [VERBOSITY]        Set verbosity filter
  -D ELECTRUM_PATH, --dir ELECTRUM_PATH
                        electrum directory
  -P, --portable        Use local 'electrum_data' directory
  -w WALLET_PATH, --wallet WALLET_PATH
                        wallet path
  --testnet             Use Testnet
  --regtest             Use Regtest
  --simnet              Use Simnet
[root@v48807 .bitcoin]# electrum create -w w/huge1
{
    "msg": "Please keep your seed in a safe place; if you lose it, you will not be able to restore your wallet.",
    "path": "/var/cryptobox/.bitcoin/w/huge1",
    "seed": "ice injury bubble leisure tumble harbor record measure fitness hire occur radio"
}
[root@v48807 .bitcoin]# electrum importprivkey -w w/huge1 ?
Error: This type of wallet cannot import private keys. Try to create a new wallet with that key.
[root@v48807 .bitcoin]#

How I can create a wallet which is able to import the keys?