Install Electrum Bitcoin wallet on Ubuntu 18.04

Electrum logo

You can install the light weight Electrum Bitcoin wallet with these commands. There are many advantages of using a Desktop wallet, as opposed to keeping your digital currency on an exchange, where you have less control. Another, and possibly safer solution, would be using a hardware wallet.

One of the big advantages of Electrum is that you don't have to download the entire blockchain, so you can start using it right away.

Prepare directory for installation

$ mkdir ~/.electrum
$ cd ~/.electrum

Download Electrum appImage, signature and public keys. First, check for newer versions on https://electrum.org/#download and adjust commands below accordingly

$ wget https://download.electrum.org/3.3.8/electrum-3.3.8-x86_64.AppImage
$ wget https://download.electrum.org/3.3.8/electrum-3.3.8-x86_64.AppImage.asc
$ wget https://raw.githubusercontent.com/spesmilo/electrum/master/pubkeys/ThomasV.asc

Import the public key and verify that it matches the signature file

$ gpg --import ThomasV.asc
$ gpg --verify electrum-3.3.8-x86_64.AppImage.asc

Result:

gpg: assuming signed data in 'electrum-3.3.8-x86_64.AppImage'
gpg: Signature made tor 11 jul 2019 16:26:15 CEST
gpg:                using RSA key 6694D8DE7BE8EE5631BED9502BD5824B7F9470E6
gpg: Good signature from "Thomas Voegtlin (https://electrum.org) " [unknown]
gpg:                 aka "ThomasV " [unknown]
gpg:                 aka "Thomas Voegtlin " [unknown]
gpg: WARNING: This key is not certified with a trusted signature!
gpg:          There is no indication that the signature belongs to the owner.
Primary key fingerprint: 6694 D8DE 7BE8 EE56 31BE  D950 2BD5 824B 7F94 70E6

From what I understand the WARNING bit "... can be ignored. The important thing is the "Good signature...." message. The "not certified with a trusted signature..." message just means that you haven't used your own private key to sign the Mint key as trusted."
From https://forums.linuxmint.com/viewtopic.php?t=243316

Make Electrum executable
$ chmod u+x electrum-3.3.8-x86_64.AppImage

Add Electrum to Applications and Dash overlay

This way you can find and start the program by pressing Windows key, and searching for it.

First, install Alacarte Menu Editor
$ sudo apt install alacarte

Start Alacarte by pressing Windows key, start typing alacarte, and select the program with a logo called "Main Menu", which should appear.

Click "New Item", add the following (substitute "YOUR_USERNAME" with your own user name) and click "Ok":
Name: Electrum
Command: /home/YOUR_USERNAME/.electrum/electrum-3.3.8-x86_64.AppImage

You can also add a logo, if you desire to do so. You should now be able to launch Electrum by pressing Windows key, and selecting Electrum.

Setting up Electrum

When you launch the program for the first time, you will get asked a few questions, the defaults should work fine. The most important thing is to write down the 12 words on a piece of paper, and store it in a safe location. You need these twelve words if you want to restore the wallet, and the Bitcoin in it.

This article has great information about configuration, and other important subjects A Beginner's Guide to the Electrum Bitcoin Wallet.

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Bitcoin address: bc1qxp8ev6rnypjx0z0wuss9az0qlm6q6e7l4fqx3z