Considering that the "Import" function no longer exists on Electrum.
It does exist. When creating your wallet, choose: 'Import Bitcoin addresses or private keys' -> Paste your list of private-keys -> 'Next'.In Bitcoin Core, you need to use dumpprivkey (and/or dumpwallet) to be able to access your private keys... they will start with a "5", an "L" or a "K"... and look something like this:
5Kb8kLf9zgWQnogidDA76MzPL6TsZZY36hWXMssSzNydYXYB9KF
L53fCHmQhbNp1B4JipfBtfeHZH7cAibzG9oK19XfiFzxHgAkz6JK
I dumped the private key on Bitcoin Core from the address I received the BTC, then tried sweeping it into Electrum and got an error message. I created a new standard wallet on Electrum and cliked on Wallet>Private Keys>Import>Paste Address and Private Keys. Am I doing it all wrong? Should I use another address?
If you are getting an error saying that there are "No Inputs Founds", then you have dumped the private key for an empty address... the easiest way to find which addresses currently hold coins is to use the listunspent command in Bitcoin Core. It will give you a list of all the current UTXOs your wallet holds, and which addresses hold them.You can then use dumpprivkey <addressFromListUnspent> to get the private key for each address show by listunspent... and then sweep those private keys.
If you want to do it without sweeping to avoid transaction fees... then use "File -> new\restore -> Import Bitcoin Address or Private Keys" in Electrum and put in the list of private keys (not addresses)
Hello again and thank you for your reply! I've just imported the wallet to Electrum.
Is it OK that there is no seed option? You can't click on the Seed option.
I already created a password and saved a copy to a couple of flash drives. So if I format my drive, I just have to open the file, insert password and I should be ready to go? Is there another way to protect everything?
Is there anything else I should do or can I just delete Bitcoin Core? I could really use the space in my HDD.