Ubuntu:

https://launchpad.net/ubuntu/bionic

ubuntu:

wifi

iwconfig wlan0 essid name key password

nmtui

nmcli c

https://askubuntu.com/questions/461825/how-to-connect-to-wifi-from-the-command-line

wpa_cli
scan
scan_results
list_network
remove_network 1

set_network 0 ssid "name"
set_network 0 psk "passowrd"
enable_network 0

save_config
quit

pi:

http://www.monitorix.org/

https://www.ncnynl.com/category/rpi-server/

pi root login:

chown pi /etc/ssh/sshd_config

PermitRootLogin yes

passwd root

systemctl restart ssh

chown root /etc/ssh/sshd_config

Arch

dpkg --print-architecture

/etc/apt/

APT

sudo apt-get clean
sudo apt-get autoclean