New User - Ubuntu 20.04.1LTS - Can't get it installed

[John Phillips]

Good Morning,

Looking for directions/assistance with Ubuntu install.  I'm getting error messages and I'm unable to figure them out.  

I've download Ubuntu to a CD and boot from the CD drive.  I get to the Gnome desktop with the install Ubuntu icon.  That's where I get lost.  I start the installation and get where I can choose the type of installation.

I want to install Ubuntu as a dual system with Windows 10.  After selecting "Dual" system I get "Starting sector number, 494967296 exceeds the msdos partition table.  Don't have a clue on how to fix this.

I go back and choose "Something Else" with a 500GB drive attached with 3 partitions and I get the following: "No root fie system defined."   Regardless of which partition I select I get the same message.  I have choices of multiple file systems to use Ext2, Ext3 and Ext4 journaling or btrfs or JFS or Fat 16 & 32, but don't know which one to use.

Any links anyone may have that will keep me from asking no so smart questions would be greatly appreciated.

I'm also a member of Unitrunker group.

Thanks!  

John