How Do You Send and Receive ENJ with the Error “Address isn’t valid”?

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Problem scenario
You are trying to send ENJ to a different wallet/address. You see “Address isn’t valid.” What should you do?

Possible Solution #1
Double check you have the right address to receive ENJ.

Possible Solution #2
Initially ENJ used an Ethereum block chain. It now uses its own Enjin Relaychain. You may have to transfer a stablecoin or other coin to a platform or wallet and do a swap there.

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How Do You Troubleshoot “The repository is not updated and the previous index files will be used.” when You Try to Update Linux?

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Problem scenario
You run this: sudo apt -y update

You get this output that includes an error message:

Hit:1 http://us.archive.ubuntu.com/ubuntu focal InRelease
Hit:2 https://d3nt0h4h6pmmc4.cloudfront.net/ubuntu bionic InRelease
Hit:3 http://us.archive.ubuntu.com/ubuntu focal-updates InRelease
Get:4 https://dl.google.com/linux/chrome/deb stable InRelease [1,825 B]
Hit:5 http://us.archive.ubuntu.com/ubuntu focal-backports InRelease
Hit:6 http://security.ubuntu.com/ubuntu focal-security InRelease
Err:4 https://dl.google.com/linux/chrome/deb stable InRelease
The following signatures couldn’t be verified because the public key is not available: NO_PUBKEY
Reading package lists… Done
Building dependency tree
Reading state information… Done
All packages are up to date. …

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How Do You Remove a GPG from Your trusted.gpg.d Directory?

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Problem scenario
You are using a Debian distribution of Linux, and there is a .gpg file in your …/trusted.gpg.d/ directory that you want eliminated. What should you do?

Solution
1. Run this: sudo apt-key list

2. Mentally identify the matching key you want deleted. Here is an example of the output from the above command:

/etc/apt/trusted.gpg.d/cccv-archive-key.gpg
——————————————-
pub rsa3072 2021-08-14 [SC] [expired: 2022-04-24]
1234 ABCD 5678 EFGH 9101 IJKL 1112 MNOP 1314 QRST
uid [ …

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How Do You Install Firecracker on Ubuntu?

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Problem scenario
You want to install Firecracker on Ubuntu. What do you do?

Solution
Run these commands:

release_url=”https://github.com/firecracker-microvm/firecracker/releases”
latest=$(basename $(curl -fsSLI -o /dev/null -w %{url_effective} ${release_url}/latest))
arch=`uname -m`
curl -L ${release_url}/download/${latest}/firecracker-${latest}-${arch}.tgz | tar -xz

sudo mv release-${latest}-$(uname -m)/firecracker-${latest}-$(uname -m) /usr/local/bin/firecracker

sudo setfacl -m u:${USER}:rw /dev/kvm

firecracker –version …

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What Is The Command to Find What Version of SSH You Are Using?

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Problem scenario
You are concerned you have an older, vulnerable version of OpenSSH. What command should you run to see what version you are using?

Solution
ssh -V

Versions from 4.4p1 up to, but not including, 8.5p1 are not vulnerable due to a transformative patch for CVE-2006-5051, which made a previously unsafe function secure.

https://blog.qualys.com/vulnerabilities-threat-research/2024/07/01/regresshion-remote-unauthenticated-code-execution-vulnerability-in-openssh-server

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How Do You Swap a Cryptocurrency in Coinbase Wallet when You Get “You need ETH before you can make a transaction on the Ethereum network” as an Error?

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Problem scenario
You are using the Coinbase wallet. You try to swap a currency. You click on “Find best price.” But you see “You need ETH before you can make a transaction on the Ethereum network.”

You do have ETH in your wallet. How do you proceed?

Possible Solution #1
Use the Coinbase Wallet app on a phone instead of the website version.

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