Objective

I have re-edited my workspace to create ISO images for general use, originally it was developed for kitting TX120s7 and Thinkpad x220/x230. It originally used the preseed system of debian, but now it only supports AutoInstall for Ubuntu 22.04.

References

As of 22.04, the EFI boot image (boot/grub/efi.img) is no longer included in the ISO image. Please refer to the following document for more details and a workaround

• https://askubuntu.com/questions/1403546/ubuntu-22-04-build-iso-both-mbr-and-efi

Instructions for use

To download the ISO image and populate the initial files, the following tasks are performed only once.

$ make download
$ make init

The following tasks must be performed each time an ISO file is generated;

$ make setup
$ env LANG=C make geniso

In Ubuntu 22.04, the geniso task might be failed due to the locale, so it is safe to specify LANG=C.

user-data file

Customization of the installation process focuses on config/user-data.

• config/user-data.efi - Configuration to create ESP area for UEFI boot
• config/user-data.mbr - Configuration for MBR (BIOS) boot

Please place the preferred configuration file to the config/user-data.

The config/user-data.efi file is linked as config/user-data as the default setting. If your system doesn't support the EFI boot, please use the config/user-data.mbr, instead.

The following is a summary of the major setting parameters.

Default user password

Change the username: and password: lines in user-data as desired.

• ID: ubuntu
• Password: secret

The hash value specified in the password: line was generated by the command,

$ openssl passwd -6 -salt "$(openssl rand -hex 8)" secret

Other settings

SSH keys

Following is an example for providing ssh keys to the default user, ubuntu.

ssh:
  authorized-keys:
    - "ssh-ed25519 AAAAC3NzaC1lZDI1NTE5AAAAAIH8mvfUPhRddvGXBxGcvwo5m3CRVOf8RbFXwaUa9mhLX comment"
    - "..."

Support for APU/APU2

The following configurations are made to work with devices that only have a serial terminal.

• Add console=ttyS0,115200n8 to the end of the "append" line in config/isolinux/txt.cfg
• Add console=ttyS0,115200n8 to the end of the "linux" line in config/boot/grub/grub.cfg.
• Add some isolinux related tasks to Makefile

To create an ISO image for installation on the APU/APU2 from a USB stick, please conduct added tasks as follows,

$ make download
$ make init
$ make setup-isolinux

$ ln -fs user-data.mbr config/user-data
$ make setup
$ make geniso-apu