Update the list of packages

sudo apt-get update

Install pre-requisite packages.

sudo apt-get install -y wget apt-transport-https software-properties-common

Download the Microsoft repository GPG keys

wget -q "https://packages.microsoft.com/config/ubuntu/$(lsb_release -rs)/packages-microsoft-prod.deb"

Register the Microsoft repository GPG keys

sudo dpkg -i packages-microsoft-prod.deb

Update the list of packages after we added packages.microsoft.com

sudo apt-get update

Install PowerShell

sudo apt-get install -y powershell

Start PowerShell

pwsh