4.0-37-generic s390x) installation using autoinstall, follow these steps:
1. Ensure that your system meets the minimum requirements for installing Ubuntu Server on IBM z Systems or LinuxONE. These include at least 2GB of RAM and a supported disk storage option (SCSI/FCP, DASD/FBA, DASD/ECKD, or NVMe).
2. Prepare your FTP server by creating an appropriate directory structure for the installation files. This can be done using standard Linux commands such as mkdir and chmod to create directories with appropriate permissions.
3. Download the Ubuntu Server ISO image from the official website (https://ubuntu.com/download) or use a container image if preferred. The latest LTS release is 20.04, but older releases may also be used depending on your needs.
4. Use an updated installer for subiquity by downloading it directly from the Ubuntu server website (https://wiki.ubuntu.com/ServerTeam/Installation) or using a boot parameter to fetch its own components from -proposed as well. This is recommended for newer releases and can provide access to updated packages and bug fixes.
5. If you want to use the HWE kernel, opt-in by explicitly selecting it during installation or installing it on an already running system using apt. Note that this requires additional upgrades and maintenance, but provides better performance and support for newer hardware.
6. Use d-i (debian-installer) to customize your installation based on your needs. This can include selecting specific package groups, translations, debug symbols, or development packages as needed. Be aware that this may require more disk space and memory than a minimal install, so use common sense when making these choices.
7. If you have many package groups selected, consider using an appropriately sized machine for the installation target to avoid running out of resources during the process. This can also improve user experience by providing better package management tools on an installed system.
8. When installing in VLAN environments, use either automated d-i installation with preseed or interactive d-i installation with d-i priority Medium for LPARs. More details can be found in the Ubuntu on Big Iron blog (https://ubuntu-on-big-iron.blogspot.de/).
9. Be aware that installing zipl boot loader may fail if “/boot” is located on a multi-target device-mapper device, but this can be fixed with 18.04 or by formatting disk drives prior to installation from the built-in shell provided in the installer (https://wiki.ubuntu.com/LVM).
10. Finally, ensure that your root filesystem is on a supported disk storage option and run ‘update-initramfs -u’ after enabling all needed disk devices by ‘chzdev -e’. This will copy udev rules generated by chzdev into the initramfs for use at boot time (https://wiki.ubuntu.com/LVM).
11. Enjoy your new Ubuntu Server installation on IBM z Systems or LinuxONE!