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I repost my topic again with Ubuntu only. I'm sorry for the confusion. I am a newbie to set up the PXE Server. Forgive me if anything is weird in my setup. I have tried to install Ubuntu from ISO file "ubuntu-20.04.6-live-server-amd64.iso" under UEFI boot from Ubuntu PXE Server, i got the issue below

[   49.073558] PM:   Magic number: 8:683:869
[   49.121628] acpi device:e2: hash matches
[   49.168605] processor cpu29: hash matches
[   49.216599] rtc_cmos 00:00: setting system clock to 2024-01-26T04:53:11 UTC (1706244791)
[   49.319976] md: Waiting for all devices to be available before autodetect
[   49.401235] md: If you don't use raid, use raid=noautodetect
[   49.469055] md: Autodetecting RAID arrays.
[   49.518028] md: autorun ...
[   49.551411] md: ... autorun DONE.
[   49.591054] VFS: Cannot open root device "ram0" or unknown-block(0,0): error -6
[   49.678503] Please append a correct "root=" boot option; here are the available partitions:
[   49.778446] Kernel panic - not syncing: VFS: Unable to mount root fs on unknown-block(0,0)
[   49.877349] CPU: 12 PID: 1 Comm: swapper/0 Not tainted 5.4.0-144-generic #161-Ubuntu
[   49.970011] Hardware name: Dell WHITLEY, BIOS 1.0 10/13/2015
[   50.054355] Call Trace:
[   50.083586]  dump_stack+0x6d/0x8b
[   50.123205]  panic+0x101/0x2e3
[   50.159709]  mount_block_root+0x23f/0x2e8
[   50.207651]  mount_root+0x38/0x3a
[   50.247274]  prepare_namespace+0x13f/0x194
[   50.296260]  kernel_init_freeable+0x265/0x289
[   50.348365]  ? rest_init+0xb0/0xb0
[   50.389028]  kernel_init+0xe/0x110
[   50.429693]  ret_from_fork+0x1f/0x40
[   50.472453] Kernel Offset: 0x2d600000 from 0xffffffff81000000 (relocation range: 0xffffffff80000000-0xffffffffbfffffff)
[   50.601506] ---[ end Kernel panic - not syncing: VFS: Unable to mount root fs on unknown-block(0,0) ]---

Below is my setup on Ubuntu PXE Server Config file:

#setup console
serial 0 9600

#perform a local boot by default
default mfg
#boot automatically after 30 seconds in tenths of a second
time out 300


#Ramdisk support


label mfg


KERNEL /ubuntu/ubuntu/casper/vmlinuz
   APPEND  root=/dev/ram0 rw load_ramdisk=1 initrd=/ubuntu/ubuntu/casper/initrd ramdisk_size=3500000 console=ttyS0,9600n8 console=tty0,9600n8

Directory of image folder:

root@Ubuntu-Server1:/tftpboot/ubuntu/ubuntu/casper# dir
extras                   hwe-initrd          installer.squashfs.gpg
filesystem.manifest      hwe-vmlinuz         squashfs.manifest
filesystem.squashfs      initrd              vmlinuz
filesystem.squashfs.gpg  installer.squashfs
root@Ubuntu-Server1:/tftpboot/ubuntu/ubuntu/casper#

My Ubuntu PXE Server is

Operating System: Ubuntu 20.04.6 LTS
Kernel: Linux 5.4.0-170-generic

Is there anything wrong with my Ubuntu PXE Server that can be changed to fix the issue? Many Thanks if you could help.

user1763110
  • 11
  • Does anyone have an idea how to fix it? – user1763110 Jan 25 '24 at 22:46
  • Where do you have the KERNEL and APPEND lines from? The error appears to be that there is no ramdisk, which probably means that the vmlinuz image doesn't have the necessary driver. As far as I can tell, the Live ISO starts without this; you'd need only the initrd= argument. – zwets Jan 26 '24 at 00:41
  • It stands out that your do not have a url=*.iso argument. Take a look at more examples of the boot commands. This is how I set it up https://askubuntu.com/a/1235724/376778 – Andrew Lowther Jan 26 '24 at 02:39
  • I used the same setup for BIOS (legacy) mode and it worked. Don't know why it does not work on UEFI – user1763110 Jan 26 '24 at 16:30

0 Answers0