Arch Linux

ruzz

Member

Registered: 2019-04-03

Posts: 4

Waiting 30 seconds for device /dev/disk/by-label

Hello, i have some issues booting arch linux live
Basically, i have libreboot as bios, so it won't read the normal grub menu, i have to load the kernel with the command linux and set initrd from the grub cli to run many of the linux distros.
After i digit boot, the distro starts booting , but it show me the error
" ERROR: '/dev/disk/by-label' device did not show up after 30 seconds..."
"Falling back to interactive prompt"
The iso works fine on other computers , so i think it must be something wrong when i load the kernel from grub cli ?
I tried to figure it out on google, searching for old arch forum posts, but couldn't find anything.
Does anybody have some ideas? I don't even know what is /dev/disk/by-label or what is its function , so i don't know where to start for debugging.

WorMzy

Forum Moderator

From: Scotland

Registered: 2010-06-16

Posts: 11,846

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Re: Waiting 30 seconds for device /dev/disk/by-label

I've never used libreboot, but the Arch Linux live image doesn't use grub, so it sounds like you're booting into the wrong thing.

/dev/disk/by-label should be a directory which contains udev-provided "persistent" symlinks to kernel device nodes. See https://wiki.archlinux.org/index.php/Pe … ice_naming

The Arch live image should load systemd-boot or syslinux (depending on whether your system is configured to boot into UEFI or legacy mode), which should in turn boot into the live environment using the /dev/disk/by-label/ARCH_YYYYMM (e.g. 201910) path.

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sabroad

Member

Registered: 2015-05-24

Posts: 242

Re: Waiting 30 seconds for device /dev/disk/by-label

i have to load the kernel with the command linux and set initrd from the grub cli to run many of the linux distros.
After i digit boot, the distro starts booting , but it show me the error
" ERROR: '/dev/disk/by-label' device did not show up after 30 seconds..."

What exactly are the grub commands being used?

It should be something like this:

Note: Described method is for using with GRUB2.
      GRUB2 is installed on target media and archlinux-<YYYY>.<MM>.<DD>-dual.iso
      is at path <TARGET-PATH> on disk <D> and partition <P>,
      where filesystem is labeled as <TARGET-FS-LABEL>.

menuentry "Arch Linux (x86_64)" {
    set isofile="/<TARGET-PATH>/archlinux-<YYYY>.<MM>.<DD>-dual.iso"
    loopback loop (hd<D>,<P>)$isofile
    linux (loop)/arch/boot/x86_64/vmlinuz img_label=<TARGET-FS-LABEL> img_loop=$isofile
    initrd (loop)/arch/boot/x86_64/archiso.img
}

If the img_label parameter is unset you'll get the error you're seeing.

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saint_abroad

ruzz

Member

Registered: 2019-04-03

Posts: 4

Re: Waiting 30 seconds for device /dev/disk/by-label

I was exactly missing the img_label parameter,and the first two commands,thank you.
What i have to write instead of TARGET-FS-LABEL ?

Minsc

Member

Registered: 2012-07-16

Posts: 95

Re: Waiting 30 seconds for device /dev/disk/by-label

I was exactly missing the img_label parameter,and the first two commands,thank you.
What i have to write instead of TARGET-FS-LABEL ?

Label can be anything, it's just a label and will not affect your boot.

sabroad

Member

Registered: 2015-05-24

Posts: 242

Re: Waiting 30 seconds for device /dev/disk/by-label

What i have to write instead of TARGET-FS-LABEL ?

From Arch ISO how it works:

When booting, the initramfs will search for the device it was booted from via its label, ARCH_201410 for example, and will mount the root filesystem for the architecture.

The label changes each release. To get the current label, try isoinfo:

# isoinfo -d -i archlinux-2018.03.01-x86_64.iso

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