I am on a Toshiba Satellite L55 and wanted to install a Linux operating system alongside my Windows 10 OS.
Here is a great YouTube video that explains how to allow both operating systems to work alongside each other:
I had trouble creating a partition using the Windows 10 Disk Management so I downloaded this EaseUS Partition Manager program to help me set aside a big enough partition manually.
Instead of saving the Ubuntu image .iso file onto a DVD, I used a USB. There are some tutorials online on how to change some settings in your BIOS to be able to boot from a USB drive. On my Toshiba Satellite, I didn’t have to alter anything in my computer BIOS and was able to just press F12 on computer start-up and choose USB as my boot source.