[BUG]:ISO boots into GRUB command-line prompt on newer BIOSs #615
Description
The Bug and how to reproduce it
sudo eggs produce --clone
The version of Penguins Eggs
Perri's Brewery edition ver. 25.8.10
Any other notes
I LOVE this application - thank you for picking up where Remastersys left off. I have been using your app for the last couple of months and have not experienced any problems booting the ISOs created on any of my machines. After the last eggs release, it appears that the ISO created will boot fine on an older BIOS, however, newer BIOS (2018-present) consistently boot into a command prompt for GRUB. Nothing has changed in the environs of my machines. I have included the full log of the 'produce' below. Let me know if something changed on your end and if there is anything I can do here to get these newer machines to recognize the normal GRUB bootload. Thanks.
E G G S: the reproductive system of penguins
penguins-eggs Perri's Brewery edition ver. 25.8.10
command: produce --clone
eggs >>> Produce an egg....
eggs >>> this is a GUI system, calamares is available, but NOT installed
.
Disk space used: 10.9 GB
Space available: 208 GB
There are 0 snapshots taking 0 GB of disk space.
The free space should be sufficient to hold the
compressed data from the system
✔ Select yes to continue... Yes
eggs >>> creating yolk.
eggs >>> Creating yolk on /var/local/yolk.
eggs >>> Updating system.
eggs >>> Downloading packages and its dependencies.
eggs >>> - cryptsetup.
eggs >>> - grub-efi-amd64.
eggs >>> - grub-pc.
eggs >>> - keyutils.
eggs >>> - shim-signed.
eggs >>> dpkg-scanpackages -h md5,sha1,sha256 . | gzip -c > Packages.gz.
Fri, 15 Aug 2025 19:05:25 +0000
eggs >>> Writing Release.
eggs >>> Cleaning apt cache.
eggs >>> creating egg in /home/eggs/.
eggs >>> eggs will SAVE users and users' data UNCRYPTED on the live.
eggs >>> creating krill configuration files on /etc/penguins-eggs.d/krill/.
eggs >>> cleanup krill configuration files.
eggs >>> copying vmlinuz-6.14.0-27-generic on ISO/live.
eggs >>> creating /boot/initrd.img-6.14.0-27-generic using mkinitramfs on ISO/live.
eggs >>> You can enable Secure Boot on Ubuntu/x64.
eggs >>> creating grub.cfg (1) on efi.img.
eggs >>> grub.cfg (1) was copied on efi.img/${efiMnt}/boot/grub/grub.cfg.
eggs >>> copyng efi.img on (iso)/boot/grub.
eggs >>> creating grub.cfg (2) on (iso)/boot/grub.
eggs >>> creating filesystem.squashfs on ISO/live.
mksquashfs /home/eggs/.mnt/filesystem.squashfs /home/eggs/.mnt/iso/live/filesystem.squashfs -comp zstd -b 1M -Xcompression-level 3 -no-xattrs -wildcards -ef /etc/penguins-eggs.d/exclude.list -e 'boot/efi/EFI' 'boot/loader/entries/' 'etc/fstab' 'var/lib/containers/' 'var/lib/docker/' 'etc/mtab' 'etc/udev/rules.d/70-persistent-cd.rules' 'etc/udev/rules.d/70-persistent-net.rules' 'etc/rc0.dK01cryptdisks' 'etc/rc0.dK01cryptdisks-early' 'etc/rc6.dK01cryptdisks' 'etc/rc6.dK01cryptdisks-early' 'etc/rcS.dS01cryptdisks' 'etc/rcS.dS01cryptdisks-early' 'home/eggs/'
Parallel mksquashfs: Using 8 processors
Creating 4.0 filesystem on /home/eggs/.mnt/iso/live/filesystem.squashfs, block size 1048576.
[=============================================================================================] 182040/182040 100%
Exportable Squashfs 4.0 filesystem, zstd compressed, data block size 1048576
compressed data, compressed metadata, compressed fragments,
no xattrs, compressed ids
duplicates are removed
Filesystem size 3519387.77 Kbytes (3436.90 Mbytes)
33.30% of uncompressed filesystem size (10567886.21 Kbytes)
Inode table size 2233701 bytes (2181.35 Kbytes)
24.49% of uncompressed inode table size (9120840 bytes)
Directory table size 2530258 bytes (2470.96 Kbytes)
40.11% of uncompressed directory table size (6308070 bytes)
Number of duplicate files found 53596
Number of inodes 250249
Number of files 184210
Number of fragments 2014
Number of symbolic links 38884
Number of device nodes 0
Number of fifo nodes 0
Number of socket nodes 2
Number of directories 27153
Number of hard-links 37
Number of ids (unique uids + gids) 34
Number of uids 17
root (0)
colord (118)
gdm (120)
gnome-remote-desktop (988)
_apt (42)
daffy (1000)
geoclue (114)
cups-browsed (115)
fwupd-refresh (989)
man (6)
nm-openvpn (121)
uuidd (103)
saned (113)
systemd-timesync (996)
tss (105)
speech-dispatcher (111)
syslog (102)
Number of gids 29
root (0)
dip (30)
colord (120)
lp (7)
gnome-remote-desktop (988)
shadow (42)
polkitd (987)
ssl-cert (106)
daffy (1000)
crontab (997)
_ssh (104)
messagebus (101)
mail (8)
staff (50)
lpadmin (114)
fwupd-refresh (989)
man (12)
whoopsie (109)
gdm (121)
geoclue (117)
uuidd (103)
nm-openvpn (122)
saned (116)
systemd-timesync (996)
tss (105)
utmp (43)
adm (4)
systemd-journal (999)
syslog (102)
xorriso -as mkisofs -J -joliet-long -l -iso-level 3 -isohybrid-mbr /usr/lib/ISOLINUX/isohdpfx.bin -partition_offset 16 -V daffy-ThinkPad-L580 -b isolinux/isolinux.bin -c isolinux/boot.cat -no-emul-boot -boot-load-size 4 -boot-info-table -eltorito-alt-boot -e boot/grub/efi.img -isohybrid-gpt-basdat -no-emul-boot -o /home/eggs/.mnt/daffy-ThinkPad-L580_amd64_2025-08-15_1507.iso /home/eggs/.mnt/iso/
xorriso 1.5.6 : RockRidge filesystem manipulator, libburnia project.
Drive current: -outdev 'stdio:/home/eggs/.mnt/daffy-ThinkPad-L580_amd64_2025-08-15_1507.iso'
Media current: stdio file, overwriteable
Media status : is blank
Media summary: 0 sessions, 0 data blocks, 0 data, 204g free
xorriso : WARNING : -volid text is too long for Joliet (19 > 16)
xorriso : WARNING : -volid text does not comply to ISO 9660 / ECMA 119 rules
Added to ISO image: directory '/'='/home/eggs/.mnt/iso'
xorriso : UPDATE : 321 files added in 1 seconds
xorriso : UPDATE : 321 files added in 1 seconds
E G G S: the reproductive system of penguins
penguins-eggs Perri's Brewery edition ver. 25.8.10
command: produce
eggs is finished!
You can find the file iso: daffy-ThinkPad-L580_amd64_2025-08-15_1507.iso
in the nest: /home/eggs/.