I have a Asus Zenbook with windows but installed Ubuntu on it.
Now while setting up Ubuntu, I have installed some wrong files and I am not able to fix it. So I would like to reset Ubuntu, so it is the same as when I first booted it. Is this possible by one simple command or do I need to reboot my system with the USB I created?
Not entering at this discussion, your basic question is:
You must reboot your system with USB you created.There's some simple commands to do it, but as you "installed wrong files", we could imagine may some of them be critical files, so these line-commands may not do a good work for you.
To save time and be successful, just reboot USB and do a fresh install.