How to Test Ubuntu From a Live USB on a Dell XPS Without Installing

A Dell XPS is an expensive, well-built laptop, so testing a new operating system on it without disturbing Windows makes perfect sense. The good news is that Ubuntu is designed for exactly this. Its live mode runs the whole system from a USB stick, using your laptop’s memory, and leaves the internal SSD alone. You can browse, test Wi-Fi, sound, and the keyboard, then shut down, remove the stick, and boot straight back into Windows as if nothing happened.

Quick Answer

Create a bootable Ubuntu USB, plug it into your Dell XPS, restart, and press F12 repeatedly to open the one-time boot menu. Choose the USB drive under the UEFI list, then select Try Ubuntu instead of Install Ubuntu on the welcome screen. Ubuntu will run entirely from the USB and RAM. Shut down and remove the stick when you finish, and your existing SSD and Windows install stay untouched.

How Live Mode Protects Your SSD

When Ubuntu runs live, it builds a temporary system in memory. Your files, settings, and browsing during that session exist only for that session. The internal drive is not used for the running system, and Ubuntu does not write to it unless you deliberately open the drive, mount it, and save something there.

That last point matters. Live mode is safe by design, but it is not a locked box. If you open the Windows drive in the file manager and edit or delete files, those changes are real. For a pure test, simply leave the internal drive alone and work with sample files or files on another USB stick instead.

What Will Not Be Saved

Anything you download, install, or change in a normal live session disappears when you reboot. Wallpaper, Wi-Fi passwords, extra apps, and documents saved to the live desktop all vanish. Some USB tools offer a persistent storage option that keeps changes, but for a clean first test, the standard live session is better because it behaves exactly like a fresh system.

What You Need

• A USB stick of at least 8 GB that you can erase completely.
• An Ubuntu ISO you have downloaded and verified.
• A tool such as Rufus or balenaEtcher on Windows to write the ISO to the stick.
• Your XPS plugged into power, so a low battery cannot cut the test short.
• Your BitLocker recovery key saved somewhere safe, just in case Windows asks for it later.

That BitLocker point deserves emphasis. Booting another system does not damage BitLocker, but changing boot settings in the BIOS sometimes makes Windows ask for the recovery key at next start. Find the key in your Microsoft account before you begin, not after a prompt appears.

Step 1: Create the Bootable USB

1. Insert the USB stick and back up anything on it, because writing an ISO erases it fully.
2. Open your writing tool and select the Ubuntu ISO as the image.
3. Select the correct USB device. Double-check the drive letter and size so you do not pick an external hard drive by mistake.
4. Use the default settings the tool suggests for a UEFI system, then start the write.
5. Wait for a clear finished or ready message before removing the stick.

The official Ubuntu tutorial on trying Ubuntu before you install it describes this live experience and what to expect on the welcome screen, so it is worth a quick read before your first attempt.

Step 2: Boot the XPS From USB With F12

Dell laptops make this part pleasantly simple. You do not need to change permanent BIOS settings just to test Ubuntu. The one-time boot menu is enough.

1. Shut the XPS down fully, not just sleep. In Windows, hold Shift while choosing Shut down if fast startup is enabled, so the machine truly powers off.
2. Insert the Ubuntu USB stick. Use a USB-C adapter if your XPS model has no full-size USB-A port, and make sure the adapter is a data adapter, not charge-only.
3. Press the power button and immediately tap F12 again and again until the boot menu appears.
4. Under the UEFI boot options, choose the entry that names your USB stick.
5. Press Enter and wait. A black screen for a short while is normal while Ubuntu loads.

The Dell support guide to accessing UEFI and BIOS settings explains the F2 and F12 keys on Dell machines if your menu does not appear. F2 opens full setup, F12 opens the quick boot list you want here.

If Secure Boot Blocks or Worries You

Ubuntu supports Secure Boot, so on most XPS models you can leave it on. If the stick does not appear in the menu, try another USB port or adapter, rewrite the stick, and confirm in BIOS setup that USB boot is enabled. Avoid turning off security features permanently for a simple test.

Step 3: Choose Try Ubuntu, Not Install

After loading, Ubuntu may show a welcome screen with two clear choices. Select Try Ubuntu. The installer does not start, no partitions are made, and after a short wait you reach a full working desktop.

If a boot menu appears before that with several lines, the safe entries are the ones labelled Try or Install Ubuntu or simply Ubuntu. Choose that entry and then still pick the Try option on the welcome screen. Never choose an entry that mentions OEM install or erasing a disk.

What to Test While You Are There

• Wi-Fi and Bluetooth: Join your network, load a few pages, and pair a mouse or headphones if you use them.
• Display: Check brightness keys, scaling on the high-resolution XPS screen, and an external monitor if you own one.
• Sound and camera: Play a video, adjust volume keys, and open a camera app to test the webcam and microphone.
• Keyboard and trackpad: Type a paragraph, test two-finger scrolling, gestures, and the function keys.
• Sleep and wake: Close the lid, wait, and open it again to see whether the system wakes cleanly.
• Battery reading: Confirm Ubuntu sees the battery and shows a sensible percentage and time estimate.

Performance from a USB stick is slower than from an internal SSD, especially when opening apps the first time. Judge compatibility, not speed. An installed system will feel noticeably faster. If everything works here, you can later follow a full step-by-step guide to installing Ubuntu alongside Windows 11 with much more confidence.

Common Problems and Fixes

The USB does not appear in the F12 menu. Rewrite the stick, try a different adapter or port, and check that the stick works in another computer if possible. Some cheap USB-C adapters pass power but not data properly.

The screen goes black and stays black. Wait two full minutes first. If nothing happens, reboot and choose the safe graphics option from the Ubuntu boot menu, which uses basic display settings that suit troubleshooting.

Wi-Fi networks are missing. Check the hardware wireless switch or airplane mode key, then reboot the live session once. If Wi-Fi still fails, note it as a compatibility item to research for your exact XPS model before installing.

Mistakes to Avoid

• Clicking Install out of habit and then rushing through screens. Slow down at every partitioning page, or better, do not open the installer at all during a test.
• Opening the Windows drive and tidying files from Ubuntu. Any change you save there is permanent.
• Judging Ubuntu by live-session speed and assuming an install would be just as slow.
• Forgetting the BitLocker recovery key location before changing any BIOS setting.
• Removing the USB stick while the live system is still running, which can freeze the session.

Conclusion

Testing Ubuntu from a live USB on a Dell XPS is the safest possible first step. F12 gets you to the boot menu, Try Ubuntu keeps the installer closed, and the whole system runs from USB and memory. Test your hardware properly, shut down, pull the stick out, and Windows returns exactly as you left it. Only install later if the test earns it.

Frequently Asked Questions

Will a live Ubuntu session change my Windows files?

Not by itself. Ubuntu does not write to the internal SSD unless you open that drive and deliberately save, edit, or delete something. For a risk-free test, leave the Windows drive unopened in the file manager.

Why is Ubuntu slow when running from USB?

A USB stick is far slower than your internal SSD, and the system also runs in memory without a proper swap setup. Slow app launches in live mode are normal and do not predict installed performance.

Can I save files during a live session?

Yes, save them to a second USB stick, an external drive, or a cloud account in the browser. Files saved to the live desktop itself are lost at shutdown unless you created the stick with persistent storage.

My XPS only has USB-C ports. Will an adapter work?

Usually yes, as long as the adapter supports data transfer. If the stick never appears in the F12 menu, the adapter is the first suspect. A proper USB-C flash drive removes that doubt completely.

Do I need to disable Secure Boot on a Dell XPS?

Normally no. Ubuntu ships with signed boot support that works with Secure Boot enabled. Only investigate BIOS changes if the USB will not boot at all, and save your BitLocker key before changing anything.