Disk failure does not send a warning. One morning your Ubuntu system boots fine; the next morning it does not. Without a verified disk image sitting on an external drive, you are looking at hours of rebuilding from scratch, and that is the best-case scenario. Rescuezilla solves this problem with a dead-simple, GUI-driven approach to full-disk backup and recovery. This guide covers exactly how to install Rescuezilla on Ubuntu 26.04 LTS using two tested methods, walks you through the reasoning behind every command, and prepares you to take your first backup before you close this tab.

Rescuezilla 2.6.2 released in May 2026 and it is built directly on Ubuntu 26.04 LTS “Resolute Raccoon”, which means driver support for modern NVMe SSDs, USB controllers, and network adapters is current and solid. Whether you are a developer managing a local workstation or a sysadmin protecting a fleet of Ubuntu machines, this guide gives you a reliable, production-tested workflow.

What Is Rescuezilla and Why Ubuntu 26.04 LTS Users Need It

Rescuezilla is a free, open-source disk cloning and imaging tool that provides a full graphical interface on top of the same underlying engine that powers Clonezilla. It is fully compatible with Clonezilla backup images, which makes it an easy upgrade path for teams already running Clonezilla in their environments.

The tool runs in two modes. The first mode boots as a standalone live operating system from a USB drive. The second mode installs as a .deb package inside your existing Ubuntu environment. Each mode has a specific use case, and picking the wrong one wastes time and creates confusion during a real recovery event.

Here is why Ubuntu 26.04 LTS specifically matters for Rescuezilla:

• The 2.6.2 ISO uses Ubuntu 26.04 as its base, giving it access to the latest kernel and hardware support
• Partclone 0.3.47 ships bundled, which improves imaging speed and filesystem compatibility
• UEFI Secure Boot fixes introduced in the 2.6.x branch are included, reducing USB boot failures on modern laptops and desktops

Running a live ISO gives you full access to every partition on your drive, including the active Ubuntu partition. You cannot reliably back up a filesystem that is mounted and in use, and that is the exact problem the ISO method solves.

Prerequisites Before You Begin

Before jumping into the Rescuezilla on Ubuntu 26.04 setup process, confirm you have everything below in place. Missing any one of these will cause the installation to fail or produce an unreliable backup.

For the ISO (bootable USB) method:

• A 64-bit PC with Intel or AMD processor
• Minimum 1 GB RAM (2 GB recommended for a responsive live session)
• A USB drive with at least 2 GB of space (it will be completely erased)
• An external USB hard drive or SSD with enough free space to hold your disk image
• balenaEtcher downloaded from etcher.balena.io (works on Windows, Mac, and Linux)

For the .deb package method:

• Ubuntu 26.04 LTS installed and fully updated
• A user account with sudo privileges
• Active internet connection for dependency downloads
• The Rescuezilla .deb package downloaded from the official GitHub releases page

General knowledge prerequisites:

• Basic terminal navigation (cd, ls, sudo)
• Understanding that sudo grants temporary root-level access
• Familiarity with what a disk partition is

Method 1: Install Rescuezilla on Ubuntu 26.04 Using a Bootable ISO

This is the recommended method for full-disk system backups. The ISO boots as its own operating system from your USB drive, completely independent of Ubuntu. Because Rescuezilla loads entirely into RAM, your internal drives sit unmounted and accessible for a clean, consistent disk image.

Step 1: Download the Rescuezilla 2.6.2 ISO

Go to rescuezilla.com/download and download the file named rescuezilla-2.6.2-64bit.resolute.iso.

The .resolute in the filename confirms this build is based on Ubuntu 26.04 LTS (Resolute Raccoon). This version ships with the widest hardware driver coverage of any Rescuezilla release to date, particularly for newer NVMe drives and USB 3.2 controllers.

After the download finishes, verify the SHA256 checksum before doing anything else:

sha256sum ~/Downloads/rescuezilla-2.6.2-64bit.resolute.iso

Why do this? Comparing the checksum against the value published on the GitHub releases page confirms the file was not corrupted during download and was not tampered with in transit. A corrupted ISO creates a USB that appears to boot but fails mid-operation during a real recovery.

Step 2: Flash the ISO to Your USB Drive

Option A: Using balenaEtcher (recommended for most users)

1. Open balenaEtcher
2. Click “Flash from file” and select the Rescuezilla ISO
3. Click “Select target” and choose your USB drive
4. Click “Flash” and wait for it to complete

Option B: Using the terminal on Ubuntu (for experienced users)

First, identify your USB drive device name:

lsblk

Look for your USB drive in the output. It will typically appear as /dev/sdb or /dev/sdc. Confirm the size matches your USB drive before proceeding.

Then write the ISO:

sudo dd if=~/Downloads/rescuezilla-2.6.2-64bit.resolute.iso of=/dev/sdX bs=4M status=progress && sync

Replace /dev/sdX with your actual USB device.

Why use bs=4M? The bs=4M flag sets the read/write block size to 4 megabytes. This reduces the number of individual write operations, which increases transfer speed significantly compared to the default 512-byte block size.

Why add sync at the end? Linux buffers disk writes in memory for efficiency. The sync command forces all buffered data to flush to the USB drive before the terminal returns control to you. Removing the drive without running sync can leave the USB in a partially-written, unbootable state.

Critical warning: Triple-check the of=/dev/sdX device path. The dd command has no confirmation dialog. Writing to the wrong device will immediately and permanently overwrite whatever is on it.

Step 3: Configure BIOS/UEFI to Boot from USB

Reboot your machine with the USB drive plugged in. During startup, press the boot menu key for your hardware. Common keys include:

• F12 on most Dell and Lenovo systems
• F8 on ASUS motherboards
• Escape on HP systems
• F11 on MSI and Gigabyte motherboards

Select the USB drive from the boot menu.

Why change the boot order? Modern systems default to booting from the internal drive. Explicitly selecting the USB tells the firmware to load Rescuezilla’s live environment instead of Ubuntu, which is required because backing up a running, mounted filesystem produces an inconsistent image. Think of it like trying to photograph a moving car through a spinning fan; the result captures a moment, but not a clean one.

Note for UEFI systems: If the USB does not appear in the boot menu, enter BIOS/UEFI settings and temporarily disable Secure Boot. Rescuezilla 2.6.2 includes UEFI fixes, but some older firmware implementations still reject the bootloader.

Step 4: Boot into the Rescuezilla Live Environment

After selecting the USB from the boot menu, Rescuezilla loads its live environment. Select your preferred language, then choose “Start Rescuezilla” from the boot screen.

The entire system loads into RAM. Nothing gets written to your internal drive during this process.

Why does RAM-loading matter? Because your Ubuntu partition is now unmounted and accessible as raw block data. Rescuezilla can read every sector of that partition accurately, which produces a complete and consistent disk image. Any file you wrote one second before shutting down is captured in the backup.

Step 5: Verify Disk Detection

Once the Rescuezilla GUI opens, click “Backup” from the main menu. On the next screen, confirm that your Ubuntu 26.04 hard drive and all its partitions are listed.

Why verify detection before starting a backup? A hardware incompatibility (for example, an unsupported RAID controller or a USB hub interfering with drive detection) will cause the backup to fail partway through. Verifying detection upfront takes 10 seconds and saves you from discovering a failed backup at the worst possible moment.

If a drive does not appear, try plugging your backup destination drive directly into a USB 2.0 port rather than a USB 3.2 port, as some external drive enclosures have compatibility issues with newer USB standards.

Step 6: Run Your First Backup

From the Backup screen:

1. Select your source disk (your Ubuntu 26.04 drive)
2. Select your destination drive (the external USB drive)
3. Name your backup image with a date stamp, for example: ubuntu2604-backup-2026-05-17
4. Click “Next” through the remaining screens and click “Backup”

After the backup completes, click “Verify Image” from the main Rescuezilla menu and point it at your newly created backup.

Why run a Verify? A backup you have never tested is an assumption. The Verify function reads every byte of your image and checks it against the original source data. It takes a few minutes and confirms that your backup can actually be used for recovery if needed.

Method 2: Configure Rescuezilla on Ubuntu 26.04 Using the .deb Package

This method installs Rescuezilla as a standard application inside your running Ubuntu 26.04 system. Use this approach when you need to restore individual disks or non-OS partitions without booting a separate live environment.

Important limitation: The .deb installation supports Backup, Restore, and Clone operations. Image Explorer is limited to VM images only, because the partclone-nbd package needed for full image mounting is not available in the Ubuntu 26.04 repository.

Step 1: Update Your Package Index

Open a terminal and run:

sudo apt-get update

Why update first? This command refreshes your local cache of available packages from Ubuntu 26.04’s repositories. Without it, apt may attempt to install outdated versions of Rescuezilla’s dependencies. Dependency version mismatches are the most common cause of failed .deb installations on Ubuntu, and they are annoying to debug after the fact.

Step 2: Download the Rescuezilla .deb Package

Download the package directly from the official GitHub releases page:

wget https://github.com/rescuezilla/rescuezilla/releases/download/2.6.2/rescuezilla_2.6.2-1_all.deb -P ~/Downloads/

Why use the official GitHub releases page? Downloading from unofficial mirrors carries the risk of receiving a modified package. Rescuezilla depends on dozens of system-level packages that get root access during operation. A tampered package installed with sudo is a serious security risk.

Step 3: Install the Package with apt

Ubuntu 26.04 allows you to install local .deb packages along with their dependencies using apt directly:

sudo apt install ~/Downloads/rescuezilla_2.6.2-1_all.deb -y

Why use apt instead of dpkg -i? The dpkg -i command installs the package itself but does not resolve dependencies. You would get a long list of dependency errors and need to run sudo apt-get install -f to fix them afterward. Using apt install with a local file path handles both the installation and dependency resolution in a single command, which is cleaner and less error-prone.

Rescuezilla has a large dependency tree that includes packages like qemu-utils, partclone, and several Python3 modules. The total download will be several hundred megabytes even though the .deb file itself is small.

Expected output:

Reading package lists... Done
Building dependency tree... Done
Reading state information... Done
Note, selecting 'rescuezilla' instead of '/home/user/Downloads/rescuezilla_2.6.2-1_all.deb'
The following additional packages will be installed:
  partclone qemu-utils python3-gi ...
Setting up rescuezilla (2.6.2-1) ...

Step 4: Enable the NBD Kernel Module

This is the most critical step in the entire .deb installation process. Do not skip it.

For Ubuntu 26.04, use the modern module loading configuration directory:

echo "# Load NBD module for Rescuezilla disk image support" | sudo tee -a /etc/modules-load.d/modules.conf
echo "nbd" | sudo tee -a /etc/modules-load.d/modules.conf

Then verify the entry was written correctly:

cat /etc/modules-load.d/modules.conf

You should see nbd listed at the bottom of the file.

Now reboot:

sudo reboot

Why is the NBD module critical? NBD stands for Network Block Device. Rescuezilla uses the nbd-client utility to expose disk images as virtual block devices during Backup and Restore operations. Without the nbd kernel module loaded at boot, nbd-client tries to access /dev/nbd devices that do not yet exist. Rescuezilla gets stuck permanently at the “Identifying disk drives…” screen with no error message explaining why.

Why use /etc/modules-load.d/modules.conf instead of /etc/modules? Ubuntu 26.04 and other modern systemd-based distributions use /etc/modules-load.d/ as the preferred directory for specifying modules to load at boot. The older /etc/modules file still works, but the modules-load.d directory is the current standard.

Step 5: Launch Rescuezilla

After the reboot, open a terminal and launch Rescuezilla:

sudo /usr/sbin/rescuezilla

Or locate it in your applications menu under System Tools.

Why launch from /usr/sbin/? Rescuezilla installs to /usr/sbin/ because it requires elevated system permissions to read and write raw block devices. System binaries that need hardware-level access live in /usr/sbin/ by Linux Filesystem Hierarchy Standard convention.

ISO vs .deb Package: Choosing the Right Method

For full-system protection, use the ISO method. For quick restores of data partitions or secondary drives while Ubuntu is running, the .deb approach works well.

Troubleshooting Common Rescuezilla Errors on Ubuntu 26.04 LTS

Error 1: “Identifying Disk Drives…” Hangs Forever

Cause: The nbd kernel module was not loaded at boot.

Fix:

echo "nbd" | sudo tee -a /etc/modules-load.d/modules.conf
sudo reboot

After rebooting, confirm the module loaded:

lsmod | grep nbd

You should see nbd listed in the output.

Error 2: USB Drive Does Not Appear in BIOS Boot Menu

Cause: Secure Boot is blocking the Rescuezilla bootloader, or the ISO was not written correctly.

Fix: Enter BIOS/UEFI settings and temporarily disable Secure Boot. If the USB still does not appear, re-flash the ISO using balenaEtcher and test with a different USB port.

Error 3: apt Fails with Unmet Dependencies

Cause: The apt cache is stale or Ubuntu 26.04 repos are temporarily unavailable.

Fix: Run the update command again, then retry the installation:

sudo apt-get update
sudo apt install ~/Downloads/rescuezilla_2.6.2-1_all.deb -y

Error 4: External Backup Drive Not Detected in Live Session

Cause: The external drive is plugged into a USB 3.2 port with an incompatible controller, or the drive uses a filesystem not supported in the live environment.

Fix: Move the external drive to a USB 2.0 port. If the drive is formatted as NTFS or exFAT, Rescuezilla handles both, but confirm the drive spins up and is recognized by the firmware before starting the backup.

Error 5: Backup Fails with “Could Not Write to Destination”

Cause: The destination drive is full, is read-only, or the filesystem has errors.

Fix:

df -h /path/to/external/drive

sudo fsck /dev/sdX

A full Ubuntu system image typically ranges from 10 GB to 40 GB depending on what is installed. Make sure your destination drive has at least 1.5x your used disk space as free capacity.