Pwsh

Prefered

sudo apt-get update
sudo apt-get install -y wget apt-transport-https software-properties-common
source /etc/os-release

wget -q https://packages.microsoft.com/config/ubuntu/$VERSION_ID/packages-microsoft-prod.deb
sudo dpkg -i packages-microsoft-prod.deb
rm packages-microsoft-prod.deb
sudo apt-get update

sudo apt-get install -y powershell
pwsh

Must be sudo

sudo pwsh
Install-Module -Name PSWSMan
Install-WSMan

Trash

pwsh -Command 'Install-Module -Name PSWSMan'
sudo pwsh -Command 'Install-WSMan'