Quote from: jackg on Today at 12:10:42 AM

Do you know if its your address you see in the addresses tab?

Yes, in my old wallet I have two receiving addresses and and in Electrum I see one of them (starts with "1PV"....)

Quote from: jackg on Today at 12:10:42 AM

I'm thinking it's likely you've imported the wrong type of address.
According to the link I'll put at the bottom of the screen you might want to add lines of:
p2pkh:private key
p2wpkh-p2sh:private key
p2wpkh:private key

Yes, I have "p2pkh:........." because guidelines in "info" button says "p2pkh:K...... -> 1......" so first characters of key and address are correct.

Quote from: NeuroticFish on Today at 12:12:31 AM

1. Did you check your address on a block explorer for funds (chainflyer.bitflyer.jp ; blockchain.com ; ...)

On my old wallet app (where I imported private key from) I see funds and history

Quote from: NeuroticFish on Today at 12:12:31 AM

2. Is the address shown by Electrum the same as the one you have funds on?

Yes

Quote from: NeuroticFish on Today at 12:12:31 AM

3. At the step where you pasted the private key, did you click the "info" button and followed the guidelines?

Yes, I wrote there "p2pkh:[my_priv_key]" because guidelines in "info" button says "p2pkh:K...... -> 1......"

Another thing I realized is that I run Electrum on fresh Ubuntu 20.04 LTS install on VirtualBox VM. Network connection is set to NAT and I have internet connection on that VM and Electrum server status is green, but maybe it's related to port forwarding or internet connection configuration on VM ? I know I can check installing it on my host computer but unfortunately I don't trust my host windows machine enough to send my private key there.