Imagine staring at your laptop, keen to dual boot Ubuntu and Windows 11 but scared of losing your work. You use this machine for work and games, so a wrong choice feels costly. You want to try something new, but you still need your files tomorrow. Ubuntu is a Linux operating system, which means the main software that runs a computer. With both systems on your laptop, you choose which one starts. Think of one house with two front doors: each morning you pick a door, but you can only use one room at a time. Your old system stays there when you choose the new one.
But that choice starts with care, because a mistake in how you split the drive can lose data. Ubuntu’s installation guide says to back up your files before you begin. So this step-by-step guide starts with what you need to keep safe. First, you will save your files and the spare key for your locked drive. Next, you will turn off that lock and a power setting that leaves Windows half awake. You will also make room from within Windows, so the new system has a clear place to go. With those jobs done, the install choices will make more sense.
Before you dual boot: give Ubuntu a safe start
For a dual-boot plan, Ubuntu needs space, but your files need a backup first. Copy what matters before installing, so a wrong drive choice will not take your only copy. Keep that backup apart from the stick you will use for the install, because writing the image erases the stick.
For your Windows 11 laptop, check the Ubuntu 26.04 LTS requirements. You need a 2 GHz dual-core, 64-bit processor, at least 6 GB of memory, and 25 GB of free storage. Those processor terms describe the kind of computer chip it needs. Also have a USB drive ready; Ubuntu’s guide recommends 12 GB or more.
Next, check BitLocker, which locks the drive to protect its contents. Think of it as a safe with a combination lock. Its 48-digit recovery key is the spare combination you keep on paper. Follow Microsoft’s backup steps: open Start, type BitLocker, choose Manage BitLocker, then “Back up your recovery key”. Save it somewhere you can reach without this laptop.
If you saved it to your account, Microsoft explains how to find it at your recovery key page. Support cannot recreate a lost key. Then turn the encryption off, because the installer cannot safely read the drive details while it stays on. That guide also warns that some Windows versions will not let you turn it back on.
Make room for Ubuntu in your dual boot plan
A dual-boot plan gives Ubuntu its own space, so choose the right drive before making changes. A partition is a section of a drive that a system uses. You will shrink the section that holds Windows. Think of moving books to one end of a shelf to make room for a new set.
To resize the Windows partition, open Disk Management in Windows. Right-click Start, choose Disk Management, then right-click C: and select “Shrink Volume”. Enter how much space to free in MB, the storage units shown in that box. Aim to leave at least the storage amount listed above for the new system. Allow more if you plan to keep files there.
The freed area shows as “unallocated space”, which means no system uses it yet. Shrinking moves ordinary files without a reformat, a process that rebuilds a drive’s layout. But some files cannot move, so Windows may offer less room than you hoped. If that happens, pause and review the space you have before going further.
Next, turn off Windows Fast Startup, a power setting that saves part of the system’s state. Windows only pretends to shut down, like leaving your coat on a chair so the room still looks taken. That can leave its drive unsafe for changes, so the other system may refuse to open it. Open Control Panel, then Power Options, then “Choose what the power buttons do”. Select “Change settings that are currently unavailable” and untick “Turn on fast startup”.
Start the stick and choose the safe install path
Make a bootable USB, a stick that can start the laptop. Ubuntu’s guide uses balenaEtcher, which works across the main desktop systems. Rufus is a free Windows-only choice. Both write the downloaded image, a file that holds the system, to the stick. Check which stick you select, because writing it erases its contents.
Imagine returning to your work laptop with space ready and the stick prepared. This live USB acts like a guest key: it lets the laptop start from the stick instead of its own drive. Restart with it plugged in. If the installer does not appear, the startup guide says to hold F12 and select the stick. Escape, F2, and F10 are common alternatives.
In a dual-boot setup, Ubuntu must sit beside the system you already use. To install Ubuntu alongside Windows 11, choose “Installing Ubuntu alongside another operating system”. That choice keeps Windows. The “Erase disk and install Ubuntu” option wipes the drive, including Windows, so never select it for this plan. Manual partitioning means choosing the drive sections yourself; that is the advanced path.
Also, you do not need to disable Secure Boot, the startup check that acts like a bouncer checking ID. Ubuntu’s security guide explains that its first startup program carries Microsoft’s trusted signature. Installing third-party drivers, extra software for hardware, may bring up a blue “Enroll MOK” screen at the first restart. That step adds a trusted key for those drivers, so choose it, check, and confirm.
Find Ubuntu through your dual boot choices
A dual-boot laptop needs a clear path to Ubuntu and to your old system. After the install, the GRUB bootloader, the small program that lets you choose a system, shows a startup list. Think of the GRUB menu as a hallway sign pointing to both doors. Use the arrow keys to pick the door you want.
The list includes the new system and Windows Boot Manager, the entry that starts your old one. So you can boot Windows when you need your usual tools or games. You do not have to make a lasting choice each time. The point of this setup is to keep both paths open.
But the laptop may go straight to Windows instead of showing the boot menu. If that happens, open UEFI or BIOS, the laptop’s built-in startup settings. Then adjust the boot order by moving the entry named “ubuntu” above the Windows entry. That tells the laptop which startup entry to try first.
If you start with a blank drive, install Windows first and the new system second. The Ubuntu installer can detect Windows, while the other installer does not add other systems to its list. For your current laptop, Windows already holds that first place in the install sequence. Next, check the common questions before you make your first choice.
Frequently asked questions
A dual-boot setup can keep Ubuntu beside your current system, but mistakes in drive choices can still lose data. So back up first and choose the alongside option. Avoid the erase choice. Your backup is the fallback if you make a mistake, rather than a reason to rush through the screen.
No, the install guide says to turn it off before adding the new system alongside the old one. First, save your BitLocker recovery key where you can reach it. Think of that key as the spare combination for a safe, because a lost combination cannot help you when the safe stays shut.
You normally can leave that check on, because the new system has a startup program with a trusted signature. But extra drivers may need the key check described above. If the blue screen asks you to enroll that key, follow the check and confirm it rather than treating the screen as an install failure.
Use at least the minimum in the linked release notes, but leave more if you will save files in the new system. Also check what Windows lets you shrink. Some files cannot move, so the amount it offers may be smaller than the free space you expected to give up.
Choose your new start with your files safe
Imagine sitting at the same work laptop, with the startup list now in front of you. To set up dual boot with Ubuntu, you began by protecting what you could not afford to lose. You saved your files, kept the spare recovery key, and made space before starting the install. Those steps gave each choice a clear purpose.
Your dual-boot plan now gives Ubuntu a place beside the system you already know. The hallway sign points to both doors, so you can choose the new one without giving up the old one. You no longer have to guess what the erase choice means or why a drive lock matters. You know where each path leads.
So take a moment to check your backup and your saved key before you begin. Then follow the steps in order, and pause if the choices on your screen do not match the plan. Once you feel at home, face login could be a first tweak to explore. You can also read about sharing folders between computers when you want to connect your work across machines.
Finally, imagine using the arrow keys to choose the new system for the first time. Windows is still there in the list, ready when you need it. Your next step feels less like a leap because you have kept a clear way back.
