1. For Ubuntu base: 

sudo apt-get install python3-setuptools python3-pyqt5 python3-pip && sudo pip3 install https://github.com/SmartCash/electrum-smart/releases/download/v3.1.2/Linux.Electrum-smart-3.1.2.tar.gz


2. For other Linux


wget https://github.com/SmartCash/electrum-smart/releases/download/v3.1.2/Linux.Electrum-smart-3.1.2.tar.gz &&
tar -xzvf Linux.Electrum-smart-3.1.2.tar.gz &&
cd electrum-smart &&
python3 run_electrum


3. For Raspberry Pi

These short steps assume you are using the Raspbian OS and already have it installed and running.


PRELIMINARIES

Electrum is a Simplified Payment Verification (SPV) wallet. This means it is fast and lightweight (it doesn't need to store the full blockchain, just headers). Electrum depends on other full nodes in the SmartCash network to verify whether a particular smartcash payment can be made. You can find more information about Electrum on their website.


DOWNLOAD ELECTRUM

Install needed dependencies: ((Install of Python, a Programming Language and PIP, a package manager for Python packages))

sudo apt-get install python3-setuptools python3-pyqt5 python3-pip

Use the Python installer (pip) to download and install Electrum:

sudo pip3 install https://github.com/SmartCash/electrum-smart/releases/download/v3.1.2/Linux.Electrum-smart-3.1.2.tar.gz

Launch the desktop:

startx

To launch Electrum you can either open a terminal and run:

electrum-smart

Or you can find the Electrum application in the menu by going to Menu > Internet > Electrum-SMART.


P/s: Test newest features here: https://github.com/SmartCash/electrum-smart/releases