Re: Kernel panic, Unable to mount root fs

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On Sun, Mar 15, 2026, 14:35 Willem Oldeman <
[email protected]> wrote:

> Dear LFS community,
>
> I am building an LFS 13.0 system, but I run into an issue booting
> it. Version 13.0-systemd.
>
> I followed the steps in
> https://www.linuxfromscratch.org/lfs/view/stable-systemd/index.html
> but my system doesn't want to boot into LFS yet.
> When booting LFS, I get an error: Kernel Panic "Please reboot your
> computer. VFS: Unable to mount root fs on unknown-block(0,0)".
>
> Current setup:
> - Ubuntu 24.04 on an Asus laptop, using an nvme drive. Ubuntu loads fine.
> - For now, I want to keep Ubuntu in place as the "mother", since it works.
> - I do not follow
> https://www.linuxfromscratch.org/lfs/view/stable-systemd/chapter10/grub.html,
> because I do not want to break the mother.
> - The nvme drive has been repartitioned, nvme0p1 through nvme0p3 are for
> Ubuntu, new partitions nvme0n1p4 (root) and nvme0n1p5 (home) were added for
> LFS.
> - I have added the entry /etc/grub.d/42_lfs (on mother system) with
> contents:
>
> #!/bin/sh
> exec tail -n +3 $0
> menuentry "Linux From Scratch 13.0 (console safe mode)" {
>     insmod part_gpt
>     insmod ext2
>     set gfxpayload=1024x768x32
>     search --no-floppy --fs-uuid --set=root 85dd9c2b-a614-4f09-xxxx
>     linux /boot/vmlinuz-6.18.10-lfs-13.0-systemd \
>         root=uuid=85dd9c2b-a614-4f09-9069-xxxx \
>         ro \
>         nomodeset \
>         nouveau.modeset=0 \
>
> modprobe.blacklist=nouveau,nvidia,nvidia_drm,nvidia_modeset,nvidia_uvm
> }
>
> Where do I go wrong?
> Any hints are welcome :-)
>
> -Willem
> --
>
Willem, what filesystem did you use for your root partition, and did you
make sure that support for that filesystem is built into the kernel as
opposed to a module?

- Eric

>

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<div dir=3D"auto"><div class=3D"gmail_quote gmail_quote_container" dir=3D"a=
uto"><div dir=3D"ltr" class=3D"gmail_attr">On Sun, Mar 15, 2026, 14:35 Will=
em Oldeman &lt;<a href=3D"mailto:[email protected]">lf=
[email protected]</a>&gt; wrote:<br></div><blockquote cl=
ass=3D"gmail_quote" style=3D"margin:0 0 0 .8ex;border-left:1px #ccc solid;p=
adding-left:1ex"><div dir=3D"ltr"><div>Dear LFS community,</div><div><br></=
div><div>I am building an LFS 13.0 system, but I=C2=A0run into an issue boo=
ting it.=C2=A0Version 13.0-systemd.</div><div><br></div><div>I followed the=
 steps in=C2=A0</div><div><a href=3D"https://www.linuxfromscratch.org/lfs/v=
iew/stable-systemd/index.html" target=3D"_blank" rel=3D"noreferrer">https:/=
/www.linuxfromscratch.org/lfs/view/stable-systemd/index.html</a></div><div>=
</div><div>but my system doesn&#39;t want to boot into LFS yet.</div><div>W=
hen booting LFS, I get an error: Kernel Panic &quot;Please reboot your comp=
uter. VFS: Unable to mount root fs on unknown-block(0,0)&quot;.</div><div><=
br></div><div>Current setup:</div><div>- Ubuntu 24.04 on an Asus laptop, us=
ing an nvme drive. Ubuntu loads fine.</div><div>- For now, I want to keep U=
buntu in place as the &quot;mother&quot;, since it works.</div><div>- I do =
not follow=C2=A0<a href=3D"https://www.linuxfromscratch.org/lfs/view/stable=
-systemd/chapter10/grub.html" target=3D"_blank" rel=3D"noreferrer">https://=
www.linuxfromscratch.org/lfs/view/stable-systemd/chapter10/grub.html</a>, b=
ecause I do not want to break the mother.</div><div>- The nvme drive has be=
en repartitioned, nvme0p1 through nvme0p3 are for Ubuntu, new partitions=C2=
=A0nvme0n1p4 (root) and=C2=A0nvme0n1p5 (home) were added for LFS.</div><div=
>- I have added the entry /etc/grub.d/42_lfs (on mother system) with conten=
ts:</div><div><br></div><div>#!/bin/sh</div><div>exec tail -n +3 $0<br>menu=
entry &quot;Linux From Scratch 13.0 (console safe mode)&quot; {<br>=C2=A0 =
=C2=A0 insmod part_gpt<br>=C2=A0 =C2=A0 insmod ext2<br>=C2=A0 =C2=A0 set gf=
xpayload=3D1024x768x32<br>=C2=A0 =C2=A0 search --no-floppy --fs-uuid --set=
=3Droot 85dd9c2b-a614-4f09-xxxx<br>=C2=A0 =C2=A0 linux /boot/vmlinuz-6.18.1=
0-lfs-13.0-systemd \<br>=C2=A0 =C2=A0 =C2=A0 =C2=A0 root=3Duuid=3D85dd9c2b-=
a614-4f09-9069-xxxx \<br>=C2=A0 =C2=A0 =C2=A0 =C2=A0 ro \<br>=C2=A0 =C2=A0 =
=C2=A0 =C2=A0 nomodeset \<br>=C2=A0 =C2=A0 =C2=A0 =C2=A0 nouveau.modeset=3D=
0 \<br>=C2=A0 =C2=A0 =C2=A0 =C2=A0 modprobe.blacklist=3Dnouveau,nvidia,nvid=
ia_drm,nvidia_modeset,nvidia_uvm<br>}<br><br></div><div>Where do I go wrong=
?</div><div>Any hints are welcome :-)</div><div><br></div><div>-Willem</div=
></div>
--<br></blockquote></div><div dir=3D"auto">Willem, what filesystem did you =
use for your root partition, and did you make sure that support for that fi=
lesystem is built into the kernel as opposed to a module?</div><div dir=3D"=
auto"><br></div><div dir=3D"auto">- Eric</div><div class=3D"gmail_quote gma=
il_quote_container" dir=3D"auto"><blockquote class=3D"gmail_quote" style=3D=
"margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"></blockquot=
e></div></div>

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