Thiết lập PXE Boot Server cài đặt Ubuntu 20.04 qua mạng cho UEFI

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total 102668
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-rw-r--r-- 1 root root   955656 Dec 22 06:26 bootx64.efi
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-rw-r--r-- 1 root root  1484680 Dec 22 06:03 grubx64.efi
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-r--r--r-- 1 root root 86448612 Dec 22 06:29 initrd
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-r--r--r-- 1 root root   120820 Aug 31 07:37 ldlinux.c32
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-rw-r--r-- 1 root root    43140 Dec 23  2019 pxelinux.0
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drwxr-xr-x 2 root root     4096 Dec 22 01:43 pxelinux.cfg
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-rw-r--r-- 1 root root  2395475 Dec 22 06:04 unicode.pf2
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-r--r--r-- 1 root root 13660416 Dec 22 06:29 vmlinuz

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set default="0"
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set timeout=5
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if loadfont unicode ; then
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  set gfxmode=auto
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  set locale_dir=$prefix/locale
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  set lang=en_US
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fi
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terminal_output gfxterm
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set menu_color_normal=white/black
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set menu_color_highlight=black/light-gray
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function gfxmode {
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        set gfxpayload="${1}"
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        if [ "${1}" = "keep" ]; then
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                set vt_handoff=vt.handoff=7
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        else
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                set vt_handoff=
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        fi
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}
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set linux_gfx_mode=keep
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export linux_gfx_mode
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menuentry 'Install Ubuntu 20.04' {
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        #gfxmode $linux_gfx_mode
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        linux vmlinuz  ip=dhcp  url=http://192.168.0.139/images/ubuntu-20.04.5-live-server-amd64.iso fsck.mode=skip
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        initrd initrd
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}

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allow bootp;
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allow booting;
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max-lease-time 1200;
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default-lease-time 900;
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log-facility local7;
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option ip-forwarding    false;
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option mask-supplier    false;
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set pxetype = option pxe-system-type;
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   subnet 192.168.0.0 netmask 255.255.255.0 {
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       option routers 192.168.0.1;
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       option domain-name-servers 1.1.1.1;
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       range 192.168.0.200 192.168.0.222;
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       class "pxeclients" {
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          match if substring (option vendor-class-identifier, 0, 9) = "PXEClient";
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          next-server 192.168.0.150;
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          if pxetype=00:06 or pxetype=00:07 {
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             filename "bootx64.efi";
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          }
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          else {
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             filename "pxelinux.0";
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          }
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       }
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}