Zorin 18.1 autoinstall via PXE - guide

Tutorials & Guides
1

Hi All, just for All and for @_Antoine
I managed to get working PXE unattended install Zorin OS 18.1

Shortly said:
You need NFS 4 and PXE on your server.
Then extract initrd from Zorin-OS-18.1-Core-64-bit.iso

mkdir -p /tmp/initrd_patch/extracted
cd /tmp/initrd_patch
unmkinitramfs /srv/tftp/zorin/initrd extracted/

You need to replace 2 functions in casper:
nano extracted/main/scripts/casper

do_nfsmount() {
rc=1
modprobe "${MP_QUIET}" nfs
modprobe "${MP_QUIET}" nfsv4

[ "$quiet" != "y" ] && log_begin_msg "Trying mount -t nfs4 -o ro,nolock ${NFSROOT} ${mountpoint}"

i=0
while [ "$i" -lt 30 ]; do
    if mount -t nfs4 -o ro,nolock "${NFSROOT}" "${mountpoint}"; then
        if is_casper_path $mountpoint; then
            rc=0
            [ "$quiet" != "y" ] && log_end_msg 0
            break
        else
            umount $mountpoint
        fi
    fi
    sleep 1
    i="$(($i + 1))"
done
return ${rc}

}

AND

nfsroot=)
NFSROOT="${x#nfsroot=}"
if [ "${NFSROOT#,}" != "${NFSROOT}" ]; then
NFSOPTS="${NFSROOT#,}"
NFSROOT="${NFSROOT%%,}"
fi
export NFSROOT
export NFSOPTS
;;

recreate new initrd:
cd /tmp/initrd_patch/extracted

(
find early -mindepth 1 -printf "%P\n" | cpio -D early -o -H newc
find early2 -mindepth 1 -printf "%P\n" 2>/dev/null | cpio -D early2 -o -H newc 2>/dev/null
find main -mindepth 1 -printf "%P\n" | cpio -D main -o -H newc | zstd -19 -T0
) | sudo tee /srv/tftp/zorin/initrd > /dev/null

3. privilegies TFTP

sudo chmod 644 /srv/tftp/zorin/initrd

And group.cfg looks like:

menuentry "Zorin OS 18.1 - Automaticka instalace" {
set gfxpayload=keep

linux /zorin/vmlinuz \
    ip=dhcp \
    boot=casper \
    netboot=nfs \
    nfsroot=10.0.0.51:/zorin \
    url=http://10.0.0.51/zorin/zorin.seed \
    fsck.mode=skip \
    automatic-ubiquity \
    noprompt \
    quiet \
    ---

initrd /zorin/initrd

}

It was very quick. but by the time I'll try to make detailed guide.

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