Just to triple verify, redownloaded Ubuntu Server 22.04.3: https://distro.libre.computer/ci/ubuntu/22.04/ubuntu-22.04.3-preinstalled-server-arm64%2Baml-s905x-cc.img.xz
On fresh install and first boot, it has kernel 6.1.54-10001-gd517e36a604d:
ubuntu@ubuntu-22:~$ cat /etc/os-release
PRETTY_NAME="Ubuntu 22.04.3 LTS"
NAME="Ubuntu"
VERSION_ID="22.04"
VERSION="22.04.3 LTS (Jammy Jellyfish)"
VERSION_CODENAME=jammy
ID=ubuntu
ID_LIKE=debian
HOME_URL="https://www.ubuntu.com/"
SUPPORT_URL="https://help.ubuntu.com/"
BUG_REPORT_URL="https://bugs.launchpad.net/ubuntu/"
PRIVACY_POLICY_URL="https://www.ubuntu.com/legal/terms-and-policies/privacy-policy"
UBUNTU_CODENAME=jammy
ubuntu@ubuntu-22:~$ uname -a
Linux ubuntu-22 6.1.54-10001-gd517e36a604d #1 SMP PREEMPT_DYNAMIC Fri Sep 22 22:11:56 EDT 2023 aarch64 aarch64 aarch64 GNU/Linux
Followed this to fix the invalid signatures for apt: Signatures were invalid: EXPKEYSIG 2E5FB7FC58C58FFB
Run updates and reboot: sudo apt update; sudo apt full-upgrade; sudo reboot
Processing triggers for initramfs-tools (0.140ubuntu13.5) ...
update-initramfs: Generating /boot/initrd.img-6.12.41-gfe345274f0aa
System will no longer boot, kernel 6.12.41-gfe345274f0aa was installed as part of the updates.