how to use automatic-ubiquity or only-ubiquity to unattended pxe boot install ubuntu and linux mint

[Jelle de Jong]

Hello everybody,

I been trying to create automatic installers with a preseed file for 
ubuntu 18 and linux mint 19.

ubuntu-18.04.1-desktop-amd64.iso
linuxmint-19.1-cinnamon-64bit.iso

I have both install iso mount content available over http
http://192.168.40.1/ubuntu18-iso/
http://192.168.40.1/linuxmint19-iso/

https://wiki.ubuntu.com/UbiquityAutomation

I am trying all kinds of options to try kick of the installer but I keep 
receiving "Unable to find medium containing a live file system.

Question 1) how do I kick of the installer correctly with my preseed file?

Question 2) how do I configure between a net install pull from online 
repos and from pulling from the files available on the iso mounts?

I have been trying both vmlinuz and initrd.lz provided by ubuntu and mint.

These are my boot options that I have been trying:

   KERNEL http://192.168.40.1/ubuntu18-iso/casper/vmlinuz
   #APPEND initrd=http://192.168.40.1/linuxmint19/initrd.lz 
url=http://192.168.40.1/{{inventory_hostname_short}}-preseed-ks-linuxmint19.cfg 
oem-config/enable=true only-ubiquity boot=casper --
   #APPEND boot=ramdisk 
ramroot=http://192.168.40.1/linuxmint19-iso/casper/filesystem.squashfs 
initrd=http://192.168.40.1/linuxmint19/initrd.lz 
url=http://192.168.40.1/{{inventory_hostname_short}}-preseed-ks-linuxmint19.cfg 
oem-config/enable=true automatic-ubiquity boot=casper --
   #APPEND netboot=http 
fetch=http://192.168.40.1/linuxmint19-iso/casper/filesystem.squashfs 
initrd=http://192.168.40.1/linuxmint19/initrd.lz 
url=http://192.168.40.1/{{inventory_hostname_short}}-preseed-ks-linuxmint19.cfg 
oem-config/enable=true automatic-ubiquity boot=casper --
   #APPEND 
url=http://192.168.40.1/{{inventory_hostname_short}}-preseed-ks-linuxmint19.cfg 
automatic-ubiquity boot=casper 
initrd=http://192.168.40.1/linuxmint19/initrd.lz quiet --
   #APPEND 
url=http://192.168.40.1/{{inventory_hostname_short}}-preseed-ks-linuxmint19.cfg 
automatic-ubiquity boot=casper 
initrd=http://192.168.40.1/linuxmint19/initrd.lz --
   APPEND initrd=http://192.168.40.1/ubuntu18-iso/casper/initrd.lz 
url=http://192.168.40.1/{{inventory_hostname_short}}-preseed-ks-linuxmint19.cfg 
automatic-ubiquity boot=casper --

Kind regards,

Jelle de Jong