Zorin OS Core is a Desktop Live ISO and does not officially support Ubuntu Server’s Subiquity autoinstall.
Although Zorin is Ubuntu-based, it does not use the same installer stack. This is why autoinstall.yaml is ignored and casper fails to find the live filesystem, resulting in the initramfs shell.
At the moment, full unattended installation via iPXE is not supported for Zorin Core.
If you need automated deployment, the recommended approach is:
- Use Ubuntu Server autoinstall
- Then install GNOME + Zorin components on top
PXE booting Zorin Live is possible, but installation remains interactive.