This comment only serves to help OP an not debug the reason NFS boot
doesn't work.
I was able to boot the iso using http only:
kernel ${boot-url}nfs/focal/casper/vmlinuz
initrd ${boot-url}nfs/focal/casper/initrd
imgargs vmlinuz initrd=initrd boot=casper ip=dhcp
url=${boot-url}ubuntu/focal/ubuntu-20.04.1-desktop-amd64.iso maybe-ubiquity
boot
If you find out how to boot via NFS I'd like to know how. :)
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https://bugs.launchpad.net/bugs/1887767
Title:
ubuntu 20.04 ipxe boot fails
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