Ubuntu 20.04 Server Raspiberry Pi

Linux-ubuntu-server-raspiberrypi.txt

# SSH PASSWORD
  sudo pico /etc/ssh/sshd_config
    PasswordAuthentication yes
    PermitRootLogin yes
    sudo service sshd restart

# Ubuntu configure locale e timezone
  sudo dpkg-reconfigure locales 
  sudo dpkg-reconfigure tzdata
  
# CONFIG WIFI
  
  # List network interfaces
    $ ls /sys/class/net
    # enp0s25  lo  wlp3s0
    $ cd /etc/netplan/
    $ sudo pico /etc/netplan/50-cloud-init.yaml
    
# This file is generated from information provided by the datasource.  Changes
# to it will not persist across an instance reboot.  To disable cloud-init's
# network configuration capabilities, write a file
# /etc/cloud/cloud.cfg.d/99-disable-network-config.cfg with the following:
# network: {config: disabled}
network:
    ethernets:
        eth0:
            dhcp4: true
            optional: true
    version: 2
    wifis:
        wlp3s0:
            optional: true
            access-points:
                "SSID-NAME-HERE":
                    password: "PASSWORD-HERE"
            dhcp4: true
            link-local: [ ipv4 ]

$ sudo netplan --debug apply
$ ip a


# How to disable cloud-init in Ubuntu
# Prevent start
# Create an empty file to prevent the service from starting

  $ sudo touch /etc/cloud/cloud-init.disabled


# Uninstall
# Disable all services (uncheck everything except "None"):

  $ sudo dpkg-reconfigure cloud-init


# Uninstall the package and delete the folders

  $ sudo dpkg-reconfigure cloud-init
  $ sudo apt-get purge cloud-init
  $ sudo rm -rf /etc/cloud/ && sudo rm -rf /var/lib/cloud/
  $ sudo reboot
  
  
# Disable IPV6 in /etc/sysctl.conf:

net.ipv6.conf.all.disable_ipv6 = 1
net.ipv6.conf.default.disable_ipv6 = 1  
net.ipv6.conf.wlan0.disable_ipv6 = 1
net.ipv6.conf.lo.disable_ipv6 = 1