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The guide describes how to install PowerShell on Ubuntu 20.04
The whole installation is very easy, let's get started.

Installing PowerShell using the SNAP Store

We make SNAP installations:

apt-get install snap snapd -y

Installing PowerShell

snap install powershell --classic

We run PowerShell with a command

pwsh

Below is an example of the result of this command :

PowerShell 7.1.2
Copyright (c) Microsoft Corporation.

https://aka.ms/powershell
Type 'help' to get help.

PS /root> 

we can exit by executing the command

exit

Installing PowerShell from the Ubuntu repository

We download the .deb file

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

we install the file

dpkg -i packages-microsoft-prod.deb

We are updating packages and installing:

apt-get update -y

apt-get install powershell -y

PowerShell is started in the same way as in the case of installation with SNAP, i.e. with a command:

pwsh