Ok so I took the hard drive out of my old laptop to use as an external however now I want to use it in the old laptop again so that I can mess with Linux. Again, I did reformat it to the "default settings" which was FAT. I have installed Ubuntu on a flash drive the way that the website has says however when i put it in and restart my computer it says "Please remove all disks and restart computer". How can i solve this problem and install Ubuntu properly?
Comp Specs: Sony Vaio I3 processor 4 gb of ram 500gb HD