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Create a USB debian install disk with main packets in it, that is not the internet version, as internet will not be initially available. To do that prepare a list of needed package, including wifi driver if it is known. For exemple start from a running similar machine and :

apt install simple-cdd
mkdir build_dir
cd build_dir
dpkg --get-selections >package-list
vim package-list
mkdir profiles
grep -e '\<install$' package-list | awk '{print $1};' >profiles/my-profile.downloads

Update my-profile.downloads to include more packages if needed.

Create a config file my-cdd.config :

debian_mirror="http://ftp2.fr.debian.org/debian/"
mirror_components="main contrib non-free"
profiles="my-profile"
auto_profiles="my-profile"

Create the CD with :

build-simple-cdd --conf ./my-cdd.conf
dd bs=4M if=xxx.iso of=/dev/sdb1 && sync

- Standard install on debian, add EFI partition (512M), and remaining in a btrfs partition mounted on /

- add the USB in /etc/fstab (here /dev/sda1, found with “fdisk -l”)

/dev/sda1 /media/cdrom  iso9660 user,noauto     0       0

- Use apt-cdrom

apt-cdrom -d=/aptoncd-mountpoint add
apt update
apt install vim...

- Install networking