Ubuntu Desktop | Iso

The ability to create a customized, ready-to-run Ubuntu Desktop ISO is critical for organizations requiring consistency, reduced setup time, and offline installation capabilities. While tools like systemback and Cubic exist, they often lag behind Ubuntu release cycles or introduce unnecessary complexity. This paper describes a low-level, scriptable method using standard Linux utilities ( squashfs-tools , xorriso , chroot ) to produce a fully functional custom ISO.

| Problem | Symptom | Solution | |---------|---------|----------| | Kernel mismatch | Boot hangs after initrd | Re-run update-initramfs -u -k all inside chroot | | Missing UEFI boot | ISO boots only in BIOS | Ensure grub-efi-amd64-bin is installed on host and -e boot/grub/efi.img is in xorriso command | | SquashFS too large | ISO exceeds 4.7GB (DVD) | Use -comp zstd instead of xz (faster decompression, similar ratio) or remove /usr/share/doc/* | | MD5 mismatch | "Media check failed" on boot | Re-generate md5sum.txt any file modification, ensure no spaces in find output | ubuntu desktop iso

sudo unsquashfs -d ~/iso_workspace/squashfs-root \ ~/iso_workspace/extract-cd/casper/filesystem.squashfs The ability to create a customized, ready-to-run Ubuntu