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I've installed Bitcoin Core on Ubuntu 18.04 (CLI). Now, the version 0.20 of Bitcoin Core is released and I want to upgrade my server to it, but it seems the new version is not included in PPA yet. May you help me to upgrade my Bitcoin Core server to 0.20 in a safe and correct way please?

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This is how I usually do it. Check the wget links in https://bitcoincore.org/bin

# Download Bitcoin Core packages for Ubuntu

wget https://bitcoincore.org/bin/bitcoin-core-0.20.0/bitcoin-0.20.0-x86_64-linux-gnu.tar.gz

# check the checksum and fingerprint //optional
wget https://bitcoincore.org/bin/bitcoin-core-0.20.0/SHA256SUMS.asc
wget https://bitcoin.org/laanwj-releases.asc
sha256sum --check SHA256SUMS.asc --ignore-missing
    >expected: xxx.tar.gz: OK
gpg --import ./laanwj-releases.asc
gpg --refresh-keys
gpg --verify SHA256SUMS.asc
    >expected: Good signature from "Wladimir J. van der Laan ..."

# extract, install and check versions of the binaries
tar -xvf bitcoin-0.20.0-x86_64-linux-gnu.tar.gz
sudo install -m 0755 -o root -t /usr/local/bin bitcoin-0.20.0/bin/*
bitcoind --version
    >expected: Bitcoin Core version x0.20.0
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    When I run sha256sum --check SHA256SUMS.asc --ignore-missing I receive bitcoin-0.20.0-x86_64-linux-gnu.tar.gz: OK and sha256sum: WARNING: 20 lines are improperly formatted – Mohammad Saberi Jun 6 at 10:09
  • It's fine :) Formatting of 20 lines is improper to do sha256sum, from how I understand it, it's somewhat expected if you don't force the check sha256sum. – Tony Sanak Jun 6 at 14:31
  • I'm getting different warnings while running your codes... gpg: WARNING: This key is not certified with a trusted signature! gpg: There is no indication that the signature belongs to the owner. , gpg: no ultimately trusted keys found – Mohammad Saberi Jun 7 at 17:16
  • I think it's because it's still a key you've just downloaded from the internet. The warning says it can't confirm that this key is certified (legit). I don't know more secure way of checking validity if you're not into building the package yourself. And the only way for it to be false is if both sources would be spoofed. – Tony Sanak Jun 7 at 17:27
  • Here is extended explanation: bitcoin.stackexchange.com/questions/565/… – Tony Sanak Jun 7 at 17:29

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