The key to installing Linux dual systems after installing Windows 10 is partitioning and boot settings. 1. First use the Windows disk management tool to compress the volume to make unallocated space (such as 50GB); 2. Use Rufus or Ventoy to write Linux ISO to the USB disk and boot the USB disk from the BIOS; 3. Select "Coexist with Windows" or manually partitioning during installation (requires /, /home, swap and install GRUB to the system disk such as /dev/sda); 4. If the Windows startup item is not displayed after installation, you can run sudo update-grub on Linux. Time errors can be repaired by the timedatectl command. If Linux is uninstalled, use Windows to delete the partition and execute the bootrec command to repair the boot. The entire process can be operated in steps to successfully realize the dual system.

It is not difficult to install Linux after installing Windows 10, but some details are prone to errors. The key lies in the processing of partitioning and booting. As long as you plan the hard disk space in advance and pay attention to options during the installation process, you can successfully realize the dual system.

Preparation: Make space for hard drives

Before installing Linux, you need to leave some hard disk space for it. The disk management tool that comes with Windows can complete this operation.

• Right-click "This Computer" → Management → Disk Management
• Find your system disk (usually C disk), right-click and select "Compressed Volume"
• Enter the size of space you want to allocate to Linux (for example, 50GB = 50000MB)
• After compression, you will see an "unallocated" area, which is the space left for Linux

Note: Do not format this space, the Linux installer will handle it by itself.

Making Linux boot USB drive

You have to write the Linux image to the USB drive before you can start the installation. The following tools are recommended:

• Rufus (most commonly used under Windows)
• Ventoy (supports multiple images, suitable for long-term tossing)

The steps are roughly as follows:

• Download your favorite Linux distribution ISO files (such as Ubuntu, Deepin, Manjaro)
• Insert the USB drive and turn on Rufus
• Select USB drive and ISO files and click "Start"

After completion, restart the computer, enter the BIOS settings and start from the USB flash drive (the keys of different brands are different, usually F2/F12/Del).

Key choices when installing Linux

After starting the Linux installation interface, pay attention to the following key points:

• Select "Coexist with Windows" or Manual Partitioning in the installation type
  If the installer automatically recognizes Windows, you can directly select "Coexist with Windows", which will help you divide the space and set the boot items.

• Manual partitioning is more flexible but also more complex
  If you have selected a manual partition, remember to create:

  • / root partition (at least 20GB is recommended)
  • /home user data partition (optional, convenient for reinstallation in the future)
  • swap swap partition (equivalent to virtual memory, generally the memory size or slightly larger)

• Don't make any mistakes in the installation location of the boot program
  The last step of installation usually gives you the choice of where to install GRUB boot, be sure to select your system disk (such as /dev/sda ), otherwise it may not boot Windows properly.

Frequently Asked Questions After Installation

After installing Linux, you may encounter several minor problems. Here are some practical suggestions:

• Windows is not displayed in the boot menu?
  You can try running sudo update-grub in Linux to rescan the system.

• Time display error?
  This is because Windows and Linux handle hardware time differently. The solution is to run it in Linux:

   timedatectl set-local-rtc 1

• Don't want to use it, want to uninstall it?
  You can use Windows Disk Management to delete Linux partitions and then run them with a command prompt:

   bootrec /fixmbr
  bootrec /fixboot

  This will restore the original startup interface.

Basically that's it. The whole process seems a bit complicated, but it actually goes smoothly step by step. The key is to reserve space in advance and do not select the guidance location randomly during installation. Other problems can be solved by searching.

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