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Back up personal files before changing partitions, preserve the BitLocker recovery key if Windows encryption is enabled, and do not delete the EFI System or Windows recovery partitions. A Mint installation needs a root (/) partition; ext4 is the recommended filesystem. Mint’s guide says the base system uses roughly 15 GB and recommends giving the root partition 100 GB or more for a comfortable installation.
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What a Linux Mint dual boot actually does
A dual-boot computer has Windows and Linux Mint installed on the same machine, with a boot manager presenting a choice when the computer starts. Each operating system has its own system files and can be selected without reinstalling the other.
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One free scan finds every outdated or missing driver and matches the right update for your exact hardware.Free scan · exact hardware matchMint’s boot menu is normally provided by GRUB, installed in the computer’s EFI boot environment. The menu can list Mint and the existing Windows installation. You choose an entry with the keyboard, and the selected system starts. If you make no selection, the configured default eventually starts.
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Windows and Mint can share one physical drive, or you can place each system on a different drive. A separate drive provides more physical isolation, while a single-drive installation is usually simpler to manage in one partition layout. In either case, both installations must use a compatible firmware mode; a Windows installation started in UEFI mode should be paired with a Mint installation booted in UEFI mode.
Check these risks before touching the partitions
Make two independent backups
Copy Windows documents, photos, browser data, and any other irreplaceable files to storage that is not the computer’s internal drive. A second backup is worthwhile for files that cannot be recreated. Partitioning and bootloader work are normally routine, but a power loss, wrong partition selection, or failed drive can make an operating system temporarily unbootable.
A backup drive is preparation, not a Mint requirement. Test that important files can actually be opened from the backup before you begin.
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Record the BitLocker recovery key
BitLocker changes the consequences of firmware, partition, and bootloader changes. Microsoft explains that BitLocker requires two partitions because pre-startup authentication and system-integrity verification must be separate from the encrypted operating-system drive. A boot change can therefore cause Windows to request its recovery key even when the Windows files themselves are intact.
If BitLocker or Windows device encryption is enabled, save the recovery key in a separate, accessible location before rebooting into the Mint installer. In Windows, TPM information is available through Windows Security’s device-security details. Do not begin a partition change until you know how you will retrieve the key if Windows asks for it.
Identify the current firmware mode
Use Windows’ system information or the computer manufacturer’s firmware documentation to determine whether Windows currently boots with UEFI. Start the Mint USB in that same mode. Mixing a UEFI Windows installation with a legacy/CSM Mint boot is a common reason for missing boot entries and a computer that returns directly to Windows.
Firmware screens and one-time boot-menu keys vary by manufacturer. The relevant choices are usually labelled UEFI, EFI, Legacy, or CSM. Select the USB entry that explicitly says UEFI when Windows is installed that way.
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How much space Mint needs
The Linux Mint Installation Guide states that the operating system without additional software or personal data takes roughly 15 GB. It recommends giving the root partition 100 GB or more for a comfortable installation. The 15 GB figure is a base-system estimate, not a practical ceiling: applications, updates, caches, logs, and personal files consume additional space.
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When Windows is using most of the disk, create unallocated space by shrinking the Windows partition rather than deleting it. Leave enough room for Windows updates and applications. Mint’s installer can use the unallocated area for its Linux partitions; the exact allocation depends on the option you choose and the layout already present on the computer.
Keep the EFI and recovery partitions
Modern Windows systems commonly contain a small EFI System Partition and one or more Windows recovery partitions in addition to the main Windows volume. Do not delete, format, or move those partitions merely to create room for Mint. Shrink the large Windows data partition from within Windows and leave the existing EFI and recovery structures in place.
The EFI System Partition is where firmware finds boot files. Mint can place its boot files there without erasing Windows’ files. The recovery partitions are useful if Windows needs repair or reset later.
Choose one disk or two
| Layout | Advantages | Trade-offs |
|---|---|---|
| Both systems on one disk | One computer-wide boot menu and a straightforward shared partition layout | A partitioning mistake or failure of that disk affects both systems |
| Windows and Mint on separate disks | Greater physical isolation and easier rollback by disconnecting a drive during troubleshooting | Firmware boot order and multiple EFI entries can require more deliberate management |
Installing to a second disk does not remove the need for backups or consistent UEFI settings. It changes where the Linux partitions live; it does not make an incorrect boot-mode choice safe.
Prepare unallocated space from Windows
- Sign in to Windows and finish any pending restart or update that could interrupt the operation.
- Open Windows’ disk-management tool by searching for Create and format hard disk partitions.
- Locate the large Windows partition on the intended drive. Confirm its size and position carefully; do not select the EFI System, recovery, or other small system partitions.
- Choose Shrink Volume and enter the amount of space to remove from the Windows volume. The result should be unallocated space, not a newly formatted Windows volume.
- Restart Windows once and confirm that it still starts normally before booting the Mint USB.
If Windows will not shrink the volume as far as expected, use the amount Windows permits instead of forcing a destructive change. A smaller Mint installation is preferable to deleting a recovery partition or damaging the Windows volume.
Create and boot the Linux Mint installer
Make the installation USB
Download the Linux Mint ISO from the official Linux Mint documentation or download page and write it to a USB flash drive with a bootable-media utility. The Mint multi-boot guide describes starting the live environment from a USB stick or DVD. Use a USB drive that can be erased; writing the image removes its existing contents.
Keep the USB connected, restart the computer, and open the manufacturer’s one-time boot menu. Choose the USB’s UEFI entry when the existing Windows installation uses UEFI. Do not select a legacy entry just because it appears first in the list.
Confirm the live session before installing
Mint can run as a live system from the USB. Use that session to verify that the keyboard, display, network adapter, and storage devices are visible before committing to installation. A live session does not change the internal disk unless you launch the installer and approve changes.
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Install Mint beside Windows
Use the automatic “alongside Windows” option when it is correct
Start the installer from the live desktop. If it correctly identifies the existing Windows installation and the unallocated space, choose the option to install Linux Mint alongside Windows. This is the simplest path because the installer can create the Linux layout and configure a boot menu for both systems.
Read the proposed disk summary before accepting it. It should show the intended Windows disk, the space being allocated to Mint, and the partitions that will remain. If the summary proposes deleting Windows, formatting the wrong drive, or using a different disk than planned, cancel and investigate rather than continuing.
Use “Something else” only when you understand the layout
The Something else screen gives manual control over partitions and mount points. It is useful for a second disk, an existing Linux installation, or a carefully designed layout, but it increases the chance of selecting the wrong device.
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The installer also describes swap as useful for hibernation and as a safety buffer when physical RAM is exhausted. Swap is separate from the root requirement; choose its arrangement only after accounting for how you intend to use hibernation and how much disk space is available.
Review the final confirmation
Before clicking the final install button, inspect the device and partition list one more time. A safe confirmation shows Windows preserved, the EFI partition retained, and Mint assigned to the unallocated or deliberately selected Linux space. Once installation begins, the changes are being written to disk, so stop if the target is not unambiguous.
Complete the first reboot
When the installer finishes, shut down or restart as requested and remove the USB when the computer tells you to do so. The firmware should load the Mint-installed boot manager. Its menu should offer Linux Mint and Windows.
Select Windows once to confirm that the existing installation still starts, then restart and select Mint. This verifies both menu entries rather than assuming that a successful Mint login proves the Windows path is intact.
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If the menu appears but Windows is not listed, do not immediately repartition. A boot entry may need repair, or the installer may have been started in a different firmware mode from Windows. Check the firmware mode and the EFI entries first.
Secure Boot: keep it or disable it?
Secure Boot is a firmware policy that controls which boot components may start. Some hardware works with Mint while Secure Boot remains enabled; other systems report a Secure Boot Violation during installation or the first boot.
Mint documents two responses to that violation:
- Reinstall Mint while connected to the internet and leave the installer option for third-party software for graphics, Wi-Fi, and media unchecked.
- Enter firmware setup and disable Secure Boot, then retry the installation or boot.
Keeping Secure Boot enabled preserves the firmware policy when the installed boot components are accepted by the machine. Disabling it can be the simpler compatibility fix on hardware that rejects the Mint boot path. Whichever choice you make, record it so a later firmware reset does not leave you wondering why the boot behavior changed.
BitLocker and Windows recovery after installation
After a bootloader or firmware change, Windows may display a BitLocker recovery screen. Enter the recovery key you saved before installation. This request does not by itself mean that the Windows partition was erased; it reflects BitLocker’s pre-startup integrity checks.
If Windows starts normally but repeatedly asks for recovery, review the firmware boot order and any Secure Boot change before making more partition changes. The recovery key remains essential even when the dual-boot menu is working, because future firmware updates or boot-entry changes can trigger the same check.
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A direct Windows boot usually means that the firmware is still selecting Windows Boot Manager before Mint’s EFI entry, not that Mint vanished. Work through the least invasive checks first.
Check the firmware boot order
- Restart and enter firmware setup.
- Open the boot-order screen.
- Move the Mint or Linux entry above Windows Boot Manager, save, and restart.
- Use the firmware’s one-time boot selector to test the Mint entry without permanently changing the order.
Mint uses ubuntu as its EFI boot name for technical reasons, so an entry labelled “ubuntu” can be the Mint bootloader. The label does not mean that a second Ubuntu installation is present.
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Inspect EFI entries from Mint live mode
If firmware setup does not show a usable Mint entry, boot the Mint USB in live mode using the same UEFI mode as Windows. Open a terminal and run sudo efibootmgr to list the EFI entries and their current order. The output contains machine-specific identifiers; do not copy identifiers from another computer.
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Mint documents setting the order with a command of this form:
sudo efibootmgr --bootorder XXXX,YYYY
Replace XXXX and YYYY with the entry numbers shown on your own computer, placing the Mint entry first when that is the desired default. If the command reports that EFI variables are unavailable, the live USB was probably booted in legacy mode; restart it through its UEFI entry.
Reinstall the Mint boot menu only after identifying the partitions
Mint’s troubleshooting guidance uses lsblk in live mode to identify the Linux and EFI partitions, then mounts the Mint partition and reinstalls the GRUB menu. Device names differ between machines, especially between SATA drives and NVMe drives. Identify the actual partitions with lsblk and follow the guide’s mount and bootloader steps using those names; never substitute a device name from an example or another computer.
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After the repair, reboot without the USB and check the firmware order again. If Windows still starts first, use the one-time boot selector to determine whether the Mint entry works but is simply lower in the permanent order.
Compare the main installation choices
| Decision | More convenient choice | More controlled choice | Main concern |
|---|---|---|---|
| Where to install | One disk with Windows and Mint together | Separate physical disks | One disk shares a failure domain; two disks add boot-order complexity |
| Partitioning method | Installer’s “alongside Windows” option after it correctly detects Windows | Manual “Something else” layout | Manual selection can format the wrong partition |
| Secure Boot | Leave enabled when the hardware accepts Mint | Disable it when a documented Secure Boot Violation blocks installation | Firmware policy compatibility versus a simpler boot path |
| How to choose an OS | Shared Mint/GRUB menu at every startup | Firmware one-time boot selection for independent paths | Firmware order must point to the intended default |
Pre-reboot checklist
- Windows and personal files are backed up to separate storage.
- The BitLocker recovery key is saved and reachable.
- The Windows partition was shrunk rather than deleted.
- EFI System and Windows recovery partitions remain untouched.
- The Mint USB was booted in the same UEFI or legacy mode as Windows.
- The installer identifies the correct Windows installation and target disk.
- The Mint root partition is mounted at
/and uses ext4 when creating a manual layout. - The final installer summary shows Windows preserved.
When dual boot is the wrong risk level
Dual boot is appropriate when you need both operating systems on one computer and are comfortable managing partitions and firmware entries. It is less suitable when the computer contains irreplaceable data without a tested backup, when you cannot obtain the BitLocker recovery key, or when you are not able to identify the EFI and Windows recovery partitions confidently.
In those cases, postpone the installation until the backup and recovery position is clear. A separate test computer or another non-destructive arrangement can be safer than experimenting on the only copy of a Windows installation.
The practical answer
Linux Mint and Windows 10 or 11 can coexist reliably when Windows is installed first, Mint is booted in the same firmware mode, and the Linux installer is pointed at deliberately created unallocated space. Give Mint a properly sized ext4 root partition, preserve the EFI and recovery partitions, and treat BitLocker and Secure Boot as boot-integrity controls rather than optional details. If Windows takes over after installation, inspect EFI entries and boot order before reinstalling anything.
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