Flash using the Raspberry Pi Imager – don't forget to click into the settings cog and adjust things like username/password, host IP etc, and turn on SSH (don't bother with writing a blank ssh file to the boot partition).

nmap -sP 10.0.0.0/24 is fairly reliable.

The default user (which can now be named slack comes with: slack adm dialout cdrom sudo audio video plugdev games users input render netdev gpio i2c spi. So I don't think any groups need adding. (See buster page if needed.)

Set up a root user that can be logged in to, starting with sudo su then passwd.

Pi-hole arranges/messes with this, so if you're installing that maybe set the IP address that way.

If not, then change /etc/dhcpcd.conf:

# Example static IP configuration:
interface eth0
static ip_address=10.0.0.7/24
#static ip6_address=fd51:42f8:caae:d92e::ff/64
static routers=10.0.0.2
static domain_name_servers=8.8.8.8 8.8.4.4

[Shouldn't be necessary:] To set the hostname, use hostnamectl set-hostname walter,

Fix up /etc/hosts.

Raspbian contains more packages than Debian net install it seems.

[Starting from the “full” desktop install but pitched at headless]

apt install screen zsh

gem install pry awesome_print

  ln -s /sys/bus/w1/devices /home/slack/w1

As buster.

Copy over authorized_keys from alan.

ssh-keygen -t rsa -b 4096 -C slack-np@walter

Copy id_rsa.pub into any authosized_keys as needed.