How to Install Windows and LINUX in same Computer?

You should be fine with using Linux alongside Windows. First, make sure that the secure boot option is disabled. Also make sure to turn off Fast Boot, if it is available in your system.

Once you are done with that, start Windows and create a 3 new partitions. One partition of around 60 to 100 GB is fine, another of around 12 to 20 GB for swap memory and the third of around 20 MB for the GRUB bios.

Insert the live USB and restart PC. Press Del or F8 to enter the BIOS boot setup. Make sure the boot is set on UEFI mode. Do not install in Legacy mode, as it would result in your PC reading only one OS. If Windows is in Legacy mode, then you should install Linux in legacy mode. Otherwise don’t. Most PCs come with Windows installed in UEFI mode anyways.

Opt to boot from the live USB option, which should appear if you have chosen the right boot option, i.e. UEFI or Legacy, in your boot from device menu.

Be careful while selecting the partitions on which to install the new Linux. Select the partition with the largest disk size as your primary installation drive and format it as ext4 journal system with /home/ option set. This will be your primary directory.

Set the swap memory and select GRUB for the 20 MB partition accordingly. Once your installation completes, you should see both Windows 8 (as /dev/sda/something here) and Ubuntu (along with Memtest and other options).

In the worst case scenario, your PC will boot directly to Windows 8. If that happens, open the live USB at boot time and connect to the internet via the live session. Use Mozilla Firefox to make a Google search on Boot Disk Repair. See, how to install Boot Disk Repair via the terminal. Follow the instructions and install it. Run the tool and restart the PC. If nothing else goes wrong, your PC will boot and display the OS selection menu.
 
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