How to Fix: Dual Boot Menu is Missing I Not Shown in Windows 10
You may not see deal boot option after finish your 2nd OS installation. If your computer boot directly into Windows 10 without dual boot options, you can try deactivating fast boot function of Windows 10 and then restart your PC. Here is what you should do to disable fast boot after you boot into Windows 10.
Fix 1: Deactivating fast boot:
Step 1: Click Start button and click Settings icon. Choose System and navigate to Power & sleep. Then, click Additional power settings.
Step 2: Click Choose what the power button does. Then, click Change settings that are currently unavailable. Finally, uncheck Turn on fast startup and click Save changes button. After turning off the fast startup, you can then restart your PC to see whether the problem is solved.
Fix 2. Repair via Command Prompt
Step 1: Press "Windows + X" keys to open shortcut menu. Then, click Command Prompt (Admin).
Step 2: At the command prompt, enter the following command: bcdedit /set {bootmgr} path \EFI\ubuntu\grubx64.efi. Then, hit Enter on your keyboard. After that, type Exit to close the command prompt window.
Step 3: Restart the computer to see whether the problem is solved.
Fix 3. Try Advanced System Settings:
Step 1: Press Windows key and type: view advanced system settings. Then, hit Enter to open System Properties window Advanced tab.
Step 2: Under Startup and Recovery section, click Settings. Expand the Default operating system list box and select the other operating system. Then, click OK to save changes. After that, reboot your computer to see whether the dual boot option reappears.
Fix 4. Repair System Files Many people would like to recommend two tools:
1st EasyBCD and 2nd Boot Repair. Some people report that they have solved this problem by running them.
But I notice that a user reported the tool solved the problem by repairing a system file. If so, you can repair the system file without these tools, because Windows have offered commands to help repair system files.
Here is the tutorial:
Step 1: Type "command prompt" in Windows search box. Then, right click the Command Prompt icon and select Run as administrator.
Step 2: Type "sfc /scannow" and press Enter key. If the SFC command fails to repair system files, you can run DISM. This command should be run when your computer is connected to network.
The DISM command lines are as follows:
DISM /Online /Cleanup-image /Scanhealth DISM /Online /Cleanup-image /Restorehealth After repairing system files, you can then restart PC to see whether the problem is solved. If not, you can then try these two tools.
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