Minimal BASH Shell Displayed After Rebooting Ubuntu 22.04 Autoinstall ISO in VirtualBox

I followed this link to create an offline autoinstall for Ubuntu 22.04.

I have successfully generated the ISO using xorriso and installed it in a virtual machine on VirtualBox. However, after rebooting, the machine fails to boot into normal mode. Instead, I am presented with a minimal BASH-like line editing shell, as shown below

grub shell

The ISO was generated using the following command:

xorriso -as mkisofs -r -V 'Ubuntu-22.04-LTS-AUTO' -o ../ubuntu-nov12-test1-autoinstall.iso --grub2-mbr ../BOOT/1-Boot-NoEmul.img -partition_offset 16 --mbr-force-bootable -append_partition 2 28732ac11ff8d211ba4b00a0c93ec93b ../BOOT/2-Boot-NoEmul.img -appended_part_as_gpt -iso_mbr_part_type a2a0d0ebe5b9334487c068b6b72699c7 -c 'boot.catalog' -b 'boot/grub/i386-pc/eltorito.img' -no-emul-boot -boot-load-size 4 -boot-info-table -eltorito-alt-boot -e '--interval:appended_partition_2:::' -no-emul-boot .

grub.cfg file is as follows,

loadfont unicodeset menu_color_normal=white/blackset menu_color_highlight=black/light-graymenuentry "Try or Install Ubuntu Server" {    set gfxpayload=keep    linux   /casper/vmlinuz   autoinstall ds=nocloud\;s=/cdrom/nocloud/ ---    initrd  /casper/initrd}if [ "$grub_platform" = "efi" ]; then    menuentry 'Boot from next volume' {        exit 1    }    menuentry 'UEFI Firmware Settings' {        fwsetup    }else    menuentry 'Test memory' {        linux16 /boot/memtest86+.bin    }fi

install-sources.yaml file is as follows

- description:    en: This version installs a Desktop environment where humans are not expected to log in.  id: desktop  locale_support: none  name:    en: Ubuntu Desktop  path: filesystem.squashfs  size: 2712014848  type: fsimage  variant: server  default: true- description:    en: This version has been customized to have a small runtime footprint in environments      where humans are not expected to log in.  id: ubuntu-server-minimal  locale_support: none  name:    en: Ubuntu Server (minimized)  path: ubuntu-server-minimal.squashfs  size: 611012608  type: fsimage  variant: server- description:    en: The default install contains a curated set of packages that provide a comfortable      experience for operating your server.  id: ubuntu-server  locale_support: locale-only  name:    en: Ubuntu Server  path: ubuntu-server-minimal.ubuntu-server.squashfs  size: 1259954176  type: fsimage-layered  variant: server

@mpboden I followed your instructions and took the steps below

apt updatesudo apt install xorriso squashfs-tools gzip wget p7zip-full -y# Unpacked the Iso`smkdir server-iso-extracted desktop-iso-extracted7z -y x ~/server-iso-extracted/ubuntu-22.04.5-live-server-amd64.iso -oserver-iso/cd server-iso/mv '[BOOT]' ../BOOT7z -y x ~/desktop-iso-extracted/ubuntu-22.04.5-desktop-amd64.iso -odesktop-iso/#Unsquash the Desktop Filesystem sudo unsquashfs -d desktop-squashfs desktop-iso-extracted/desktop-iso/casper/filesystem.squashfs#Chroot into the unsquashed filesystemsudo mount --bind /dev desktop-squashfs/devsudo mount --bind /proc desktop-squashfs/procsudo mount --bind /run desktop-squashfs/runsudo mount --bind /sys desktop-squashfs/syssudo chroot desktop-squashfs# Inside the chroot, run custom scripts to install additional packages (Apache, PHP, PostgreSQL):   # Example commands for package installation   apt update   apt install -y apache2 php postgresql   # Install cloud-init for user configuration during autoinstall   apt install -y cloud-init#Exit chroot and clean up   exit   sudo umount desktop-squashfs/dev   sudo umount desktop-squashfs/proc   sudo umount desktop-squashfs/run   sudo umount desktop-squashfs/sys# Resquash the Modified Filesystemsudo mksquashfs desktop-squashfs server-iso-extracted/server-iso/casper/filesystem.squashfs -comp xz -e boot# Add Autoinstall Files to Server ISO Directory mkdir -p server-iso-extracted/server-iso/nocloudtouch user-data meta-datavi user-data     #cloud-config     autoinstall:       version: 1       identity:         hostname: ubuntu-desktop         password: $6$5lpwCLsKLEzMkSJc$keOAhA6aO/5RocGThmhVA7LSNuW911Rx5HHXFEa75oGK20cEdAAgn14H5f5nGeq6QgcSyLPrWcg1.JvjXbhrN/         realname: Ubuntu user         username: ubuntu       timezone: Asia/Kolkata       network:         version: 2         renderer: NetworkManager       refresh-installer:         update: no       keyboard:         layout: us       locale: en_US.UTF-8       late-commands:         - curtin in-target --target=/target -- apt-get install -y cloud-initgrub.cfg file is given aboveinstall-sources.yaml file is given above #Update checksums:   cd ~/server-iso-extracted/server-iso   sudo chmod +w md5sum.txt   sudo find . -type f -print0 | sudo xargs -0 md5sum | grep -v "./md5sum.txt" | sudo tee md5sum.txt   md5sum -c md5sum.txtiso generated using the xorriso command given above..

could you please look into it?

Please help me resolve this issue.