Notes:

Basics

• sudo apt update && sudo apt upgrade -y
• sudo apt install fail2ban
• sudo apt install zip unzip
• sudo apt autoremove
• sudo touch /etc/cloud/cloud-init.disabled
  sudo apt purge cloud-init -y
  sudo rm -Rf /etc/cloud

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• sudo adduser "newusername"
• sudo usermod -aG sudo "newusername"
• sudo deluser --remove-home "username"

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• sudo nano /etc/netplan/*.yaml
• sudo hostnamectl set-hostname "new hostname"
• sudo nano /etc/hosts

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• tail tail -f /var/log/sysl

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Remove PG 15 prior to re-install ( if required )

• dpkg -l | grep postgres
• sudo apt --purge remove postgresql postgresql-15 postgresql-client-15 postgresql-client-common postgresql-common postgresql-contrib
  remove directories when purged Y/n = Y
• dpkg -l | grep postgres ( verify pg has been removed )
• sudo rm -rf /var/lib/postgresql/
• sudo rm -rf /var/log/postgresql/
• sudo rm -rf /etc/postgresql/
• sudo deluser postgres
• sudo apt autoremove