Thanks, This is what I am doing now and I use virt-customize to customize these images.
It seems simple enought wget -Otesting-sixs-orig.qcow2 https://cloud.debian.org/images/cloud/trixie/daily/latest/debian-13-genericcloud-amd64-daily.qcow2 qemu-img resize testing-sixs-orig.qcow2 400G cp testing-sixs-orig.qcow2 testing-sixs.qcow2 virt-resize --expand /dev/sda1 testing-sixs-orig.qcow2 testing-sixs.qcow2 virt-customize -a testing-sixs.qcow2 -v -x -attach extra-packages.iso --commands-from-file testing-sixs.commands virt-sparsify --in-place testing-sixs.qcow2 $ cat testing-sixs.commands hostname data-analysis timezone Europe/Paris root-password password:xxxxxxxxxxxxxxxxx firstboot-command useradd -m -p yyyyyyyyyyyyyyyy -s /usr/bin/bash guest firstboot-command adduser guest sudo write /etc/apt/sources.list:deb http://deb.debian.org/debian testing main contrib non-free non-free-firmware run install.sh update install ase,bornagain,fontconfig-config,gdm3,gedit,gnome-core,pyfai,pymca,python3-natsort,python3-tables,python3-xrayutilities,silx,spyder,sudo,systemd-timesyncd,libhkl5,binoculars,ghkl edit /etc/gdm3/daemon.conf: s/# AutomaticLoginEnable/AutomaticLoginEnable/ edit /etc/gdm3/daemon.conf: s/# AutomaticLogin = user1/AutomaticLogin = guest/ firstboot-command systemctl stop gdm3 firstboot-command systemctl start gdm3 write /etc/dconf/profile/user:user-db:user append-line /etc/dconf/profile/user:system-db:local mkdir /etc/dconf/db/local.d write /etc/dconf/db/local.d/00-app-menu:[org/gnome/shell] append-line /etc/dconf/db/local.d/00-app-menu:enabled-extensions=['apps-m...@gnome-shell-extensions.gcampax.github.com'] firstboot-command dconf update I would be interested by a cloud-init equivalent, just to evaluate both solutions. cheers Fred
