Re: How do I get started
Just some information first ...
You say you have a Netbook, so did it come with Windows 7 preinstalled?
HOW did you install Ubuntu -- did you install it from inside Windows?
IF the answers to both of these are Yes, then I would advise AGAINST doing another installation -- for now. A Windows-based reinstall is only going to overwrite what it already wrote. A separate installation (if done blindly following the Ubuntu installer) risks corrupting Win7 and rendering your PC unbootable.
A safer approach is to mess with the Ubuntu boot parameters as one of the links suggested.
Also, I would second the suggestions to boot from a LiveCD of Ubuntu to see if that works without problems. It is generally a BAD idea to force an installation of Ubuntu on any untried PC without trying it first.
Ubuntu 16.04 Mate, Mint 17.3; MS Win 8.1, MS Win10 Pro.
Will not respond to PM requests for support -- use the forums.