bugGNU GRUB - Bugs: bug #63975, "no server is specified"...


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bug #63975: "no server is specified" error message when loading a font

Submitter:  Andrea <viavisolutions>
Submitted:  Wed 29 Mar 2023 11:13:21 AM UTC
Category:  User Interface Severity:  Major
Priority:  5 - Normal Item Group:  None
Status:  None Privacy:  Public
Assigned to:  None Originator Name: 
Open/Closed:  Open Release:  other
Release:  Reproducibility:  Every Time
Planned Release:  None

Wed 29 Mar 2023 11:13:21 AM UTC, original submission:  

I'm using grub 2.06 on ubuntu 22.04 to create a simple rescue disk like so:

#! /bin/sh

rm -rf build

mkdir -p build
cp vmlinuz build/

mkdir -p build/boot/grub
cat > build/boot/grub/grub.cfg << EOF
insmod all_video

echo "loading font"
loadfont unicode
echo "font loaded"
sleep 5

set gfxpayload=keep

set timeout=-1
set timeout_style=menu

menuentry linux {
  linux /vmlinuz

grub-mkrescue -o out.iso build

The resulting hybrid image can be booted in 4 different ways:
1. bios boot protocol, as a cdrom
2. bios boot protocol, as a hdd (say, a usb stick)
3. uefi boot protocol, as a cdrom
4. uefi boot protocol, as a hdd (say, a usb stick)

However, when booted in UEFI mode, loadfont will fail with:

error: no server is specified.

I'm not sure why grub would try to load something from the network; a couple of observations:
- If you drop to a command line and execute all_functional_tests, you will see additional failures related to the unicode font.
- The grub environment (as reported by "set") contains some network-related entries that are not present when booting the same image in bios mode.
- If you load the font with the full path, grub won't complain (but, according to the documentation, that shouldn't be needed).

Andrea <viavisolutions>


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