Ubuntu is a Linux OS and very good alternative of windows OS. if you can just follow simple steps and you are done in 5 min.
step 1: go to
http://www.ubuntu.com/download/ubuntu/windows-installer
Step 2 : download web installer (size 2mb) on your machine.
Step 3: a small window will appear and set you password and done
Step 4: reboot
Step 5: now you have dual boot screen
Step 6: Select ubuntu or windows 
—
Signing off for the day,
Satyadev Singh
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