@aloniada Playing with this today I figured out what changed in (U/Ku/Lu)buntu and Mint from 20.04 (or maybe earlier) that causes the mentioned error Unable to find a live file system on the network even if you add the ip= parameter (which you definitely have to!)…
You need to copy the hidden folder .disk from the ISO as well which is missed when using the copy command. See more details here: https://forums.fogproject.org/topic/14590/20-04-autoinstall
But be aware that in your case you need to get the ip= parameter right first so the NFS over TCP not available ... error goes away!
this is a VM from the server itself so no way it’s network issue
I also ran into an issue where ip=dhcp did not work in a VM setup. I actually had to set a static IP - which really is a shame!!! So instead of ip=dhcp this worked for me:
... ip=192.168.3.123::192.168.3.1:255.255.255.0:hostname:enp0s3:none:192.168.3.1 ...