How to download Linux OS and how to install it?

There are plenty of options when it comes to Linux. You have to choose which Linux distro is good for your taste. Ubuntu and Linux Mate are popular distributions. So choose one distro among them and follow the instructions below. In this case I am giving instruction for Ubuntu Linux.

1. Download Linux DVD .ISO from ubuntu.com
2. Burn the DVD image and verify if it's bootable.
3. Now change the BIOS settings in your computer to boot from USB or DVD.
4. Boot into the Ubuntu desktop session from DVD. Run the installer once the desktop shows up.
5. Choose Dual boot install option.
6. Let the installation proceed. And once completed boot by removing the DVD.
7. During the boot you get the choice for either Linux or Mac or Windows. In case of Mac you'd have another official bootloader overwriting the Ubuntu's.

This is the typical process of the installation. I suggest checking following resources as well.

1. Pendrive Linux : pendrivelinux.com
This site to learn how to make bootable linux DVD or USB.

2. Ubuntu on Mac dual boot install walkthrough
https://www.youtube.com/watch?v=IQIaDO9nR6Y

3. Ubuntu on Windows dual boot install walkthrough
https://www.youtube.com/watch?v=JvBZBfY5Pfc

Hope this helps you to install Linux on your machine depending on the OS the specific instruction may vary. So I suggest checking out Youtube in that case.

If you have installed Windows 10 free operating system you can still install Linux on your computer. Linux can be run simply from a USB drive without even the need to modify the existing system.
Here are the things you need to remember.
1. A "dual boot" system for installing Linux distribution alongside the Windows will provide you with an option of using either of the operating systems each time when you start up your PC. It is an ideal way to install Linux, as that way you will always have the chance to get back again to a full Windows system just with a single reboot.

2. If you are going for a dual-boot, what should be of primary importance is to install Linux on any system preferably when Windows has been already installed. So, if your hard drive is empty, first install the Windows, then the Linux.

3. Then follow these steps:
a) Choose the Linux distribution.
b) Download Linux and create a USB installation media or simply burn it to a DVD.
c) Boot the Linux Os on a PC that is already running on Windows.
d) After launching the installer follow the instructions.
e) Now choose the option that says 'install the Linux system alongside Windows', or you can even opt for the manual partitioning and yourself create a Linux partitions along with the Windows.
f) Never choose the overwriting option of replacing Windows system with Linux. Otherwise, your system can be messed up, and if you feel like going back to Windows, it would be a laborious process.

Linux can be treated as the base for a lot of open source operating systems. Being an open source system, it is available for free download. It is available in different versions.

You can follow the steps here below -
1. Download Linux distribution that you are interested in. I would suggest opting for a lighter version for the ease of installation. Ubuntu and Lubuntu are the two popular versions. You can opt for the distributions - referred to as distros - depending upon your preferences.

2. Downlaod the ISO image and burn it on a DVD or a USB.

3. You may need to change the boot settings to USB or DVD as the case may be. Most of the laptops and computers are configured to boot from hard drive.

4. Once you have changed the boot options, you can restart your computer while inserting the USB stick or DVD in the drive. The device will boot into the USB/DVD mode.

5. Most Linux distros come with a test option to check out the interface and the operating system before you can actually install it. Make use of this preview feature.

6. If you have decided to install the OS, proceed either through the boot menu or desktop.

7. Enter the basic details like language, keyboard layout and time zone.

8. Create a username and password for you. You will need to create a new partition for installing the OS as dual boot. In fact, I would advise installing it as a dual boot as this will give you an option of switching between Windows(or Mac, as the case may be) and Linux ( in the form of Ubuntu or Lubuntu). Most Linux distros create the partition on their own.

9. Let the installation finish to its completion. Once done your device will reboot.

10. You should now be greeted with what is called GNU GRUB. Choose your Linux distro from the list.

11. Download and install the additional drivers if required. Most of the hardware should work seamlessly. If you need to download any driver, you may need to do it from the manufacturer website. If you are installing Ubuntu, you can install the drivers from System Settings.

12. Begin using the Linux OS on your system.

The Choice should be yours as long as which Linux distro you would want to install on your computer. Linux Mint, Linux Debian and Ubuntu Fedora are some of the commonly used distros.