Windows 8.x and 10: how to prepare it for dual boot with Ubuntu or Linux Mint


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Do you want to install Ubuntu or Linux Mint next to Windows 8.x or 10, in order to create a dual boot computer? Then first you have to change some settings in Windows 8.x or 10, and when you have a pre-installed Windows 8.x or 10, also in the UEFI ("BIOS"). As follows:


Disable Fast Startup (no loss, it's misleading anyway)

1. In Windows 8.x and 10, you first have to disable Fast Startup. Fast Startup is essentially an advanced hibernation: shutdown doesn't really shut your computer down, but puts it in a sleep condition.

By disabling Fast Startup a shutdown becomes a real shutdown again, which makes the Windows partition on your hard disk, accessible and resizable by Ubuntu or Linux Mint.

Disable Fast Startup like this:

a. Control Panel - Power Options - Choose what the power buttons do

b. Now click on Change settings that are currently unavailable. See the screenshot below (click on it to enlarge it):

https://sites.google.com/site/easylinuxtipsproject/windows/Change-settings-that-are-currently-unavailable.jpg?attredirects=0


c. Now remove the tick for Turn on fast startup (recommended), even though this bothersome feature is supposedly "recommended". See the screenshot below (click on it to enlarge it):

https://sites.google.com/site/easylinuxtipsproject/windows/Turn_Off_Fast_Startup.jpg?attredirects=0

d. Click on Save changes.

e. Reboot your computer. Don't shut it down! It has to be a reboot, in order to make this settings change permanent.

If you have an older computer which was originally sold with a pre-installed Windows 7, Vista or XP (which means old-fashioned BIOS): you're done! You can continue with the actual installation of Linux Mint or the installation of Ubuntu.

But if your computer was sold with a pre-installed Windows 8.x or 10 (which means modern UEFI), please read on.


Change some UEFI settings

2. Open the configuration of your UEFI. If you don't know how to do that, see the manual of your computer. Don't you have the manual anymore? You should always be able to find a copy in the support section of the website of the manufacturer.

For an Acer, you have to press the F2 key a couple of times, directly after turning on the computer.

Can't you succeed in accessing the UEFI configuration? Then you can also evoke it from within Windows 10, in an annoyingly cumbersome way (the procedure in Windows 8.x is almost identical):

Click on the magnifier icon in the panel of Windows 10 - let it search your system ("Search Windows") with the term settings
Click on the first (preselected) result, namely the appĀ Settings

Then: Update & security - Recovery - Advanced startup - Restart now

Then: Troubleshoot - Advanced options - UEFI Firmware Settings - Restart

Finally, at very long last (sigh....) you should now be able to access the UEFI configuration.


Disable Secure Boot

2.1. Now disable Secure Boot in the UEFI. For Ubuntu this is often no longer necessary, because Ubuntu (unlike Linux Mint) contains a digital signature for Secure Boot. However, sometimes it still causes problems even for Ubuntu. So when your UEFI allows for it, I advise to disable Secure Boot in all cases.

Note: in some cases, you need to set an administrator password in the UEFI before you can disable Secure Boot.

See the screenshot below, of the UEFI of an Acer TravelMate laptop (click on the picture to enlarge it):

https://sites.google.com/site/easylinuxtipsproject/windows/UEFI-Secure_Boot.JPG?attredirects=0

Put Windows Boot Manager at the bottom of the boot priority order

2.2. Then you put the Windows Boot Manager (sometimes called: OS Boot Manager) permanently at the bottom of the boot priority order. See the screenshot below of the UEFI of an Acer Travelmate laptop (click on it to enlarge it):

https://sites.google.com/site/easylinuxtipsproject/windows/UEFI-Boot_Priority_Order.JPG?attredirects=0


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Enable the key for one-time boot priority changes

2.3. Finally, enable the key for temporary one-time changes in the boot priority order. For an Acer that's usually F12, but this varies among manufacturers). See the screenshot below (click on it to enlarge it):

https://sites.google.com/site/easylinuxtipsproject/windows/UEFI-F12.JPG?attredirects=0

Save and exit.

Sometimes necessary: enable CSM (in some cases: Legacy)

2.4. In some cases it's necessary to enable CSM (Compatibility Support Module). In some cases this is called "Legacy". This provides legacy BIOS compatibility, by emulating an old-fashioned BIOS environment.

You should find this option in each UEFI, usually in the Boot section. ASUS calls it "Launch CSM".

First try it without CSM, because in a few cases CSM creates problems of its own. So only do this when necessary.

Select 64-bit Ubuntu for installing and not 32-bit

3. For computers with Windows 8.x and 10, always select the 64-bit edition of Ubuntu or Linux Mint and not the 32-bit edition. A computer with Windows 8.x or 10 with UEFI, needs a 64-bit operating system.

That's it! Now you can create a dual boot with Linux Mint or create a dual boot with Ubuntu.

In case of emergencies: perform a one-time boot priority change

4. Note: after installation of Ubuntu, Windows 8.x or 10 might not appear in the Grub bootloader menu. Or the boot entry for Windows 8.x or 10 in the Grub menu, might not work.

In those cases, you can still boot Windows 8.x or 10 by using the key for one-time changes in the boot priority order (for Acer: F12). That way, you bypass Grub entirely and you can boot Windows 8.x or 10 directly from the UEFI.

In that one-time UEFI boot menu, select Windows Boot manager. See the screenshot below of an Acer laptop (click on the picture to enlarge it):

https://sites.google.com/site/easylinuxtipsproject/windows/UEFI-Boot_Manager.JPG?attredirects=0

Now Windows 8.x or 10 will boot normally.


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