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Dual Booting With Windows

You can install Ubuntu alongside Windows using a shared disk with partitioning.

Step 1: Prepare Windows​

  1. Back up your data (just in case).
  2. Open Disk Management (Win + X → Disk Management).
  3. Right-click your main drive (usually C:) → Shrink Volume.
  4. Free at least 20–50 GB for Ubuntu (recommended).
  5. Leave the new space unallocated (do not format it).

Step 2: Boot the Ubuntu USB Installer​

  1. Insert the USB and reboot the system
  2. Enter BIOS/UEFI (usually by pressing F2, Del, F12, or Esc during startup)
  3. Set the USB as the first boot device
  4. Save changes and reboot

Step 3: Install Ubuntu Alongside Windows​

  1. Select Try or Install Ubuntu
  2. When prompted for installation type, select: Install Ubuntu alongside Windows Boot Manager
  3. Use the slider to allocate how much space to give to Ubuntu
  4. Continue installation as prompted

Step 4: Bootloader Setup​

  1. After installation, you’ll see the GRUB boot menu at startup
  2. Select between Ubuntu and Windows each time you boot

Fixing Boot Issues​

If Windows doesn't show up in the GRUB menu:

sudo os-prober
sudo update-grub

Or use Boot-Repair from a live USB.