Ubuntu starts only when I boot from my flash drive
I am a newbie on linux and dont understand many things unless given a line by line instructions. I am trying but linux does take some getting used to.
I have installed ubuntu from live usb stick. Now I cannot boot my system without the usb being plugged in. There are answers whereby certain commands need to be run. For any command that I run with sudo (prefix) the terminal asks me for a password which I dont know.
What do I do? How do I fix it such that the booting happens without usb being plugged in.
So far I have just been booting from USB. Please help a recent converted from Windows.