Will I be able to use Ubuntu as an independent os, If I run it from a flash drive?
In Other words, will everything work like as if the OS was installed on the actual HD of the system?

Access graphics driver, networking, file share, play games, run vms etc?

Edit: One more thing, lets say I boot the flash trough a vm and later through the pc it self, will this effect ubuntu on the flash badly? or is this not recommended?