Well, if you have a DVD burner drive, which is pretty much standard on computers today, you can just download the Ubuntu ISO image and burn it to disk without a fuss.
There used to be a program called ShipIt that would send you a copy of Ubuntu free of charge, but Canonical shut it down.
Otherwise you'll have to spend a (Nominal) amount of money to buy a copy from sites like Distro Watch.
UBUNTU
Use Truecrypt. Linux is a supported OS.
When you first install Ubuntu, it will walk you through the steps to install it and keep your other OS installed. Then when you boot your dual-boot system, you can simply select Ubuntu.
Windows 10 is currently a free operating system and can be downloaded on the Microsoft website, Ubuntu OS is also a free operating system, it can be Downloaded from the Ubuntu website Ubuntu.com/download
No. Ubuntu is an OS (operating system) which contains only open source code, which means that anyone anywhere is free to edit and distribute the software that comprises the Ubuntu OS. Ubuntu is distributed by the South African company, Canonical Ltd. http://www.canonical.com/about-canonical
Linux.
You could easily download Chrome for Ubuntu OS. It is available on the Chrome website as well.
A legitimate copy of Mac OS X 10.4 will only be available to buy.
If you are starting and new to Linux try Zorin OS. If you are experienced and know more about and how to use Linux the get Ubuntu.
Ubuntu is a Linux distribution (as in a specific OS setup with the Linux kernel.)
Ubuntu is an open-source OS, so it is absolutely free. You can download freely and install in different ways using a DVD or USB stick or just using it as a windows application on windows. Refer to the related links for more information.
Heard of different OS's like ArtistX, Ubuntu Studio and dyne;bolic, but really now, who wants these Ubuntu forks when you can download genuine Ubuntu, and get all the free multimedia packages like Blender, Audacity and GIMP (etc...). My advice: go to Ubuntu website and download it (desktop edition) - and if your internet connection is so slow that a >700Mb OS will take like 10 days to get, rather request FREE CD (I went for both options ;)