Change Boot Order

[alreadysheepish]

I've got a backed up version of a Ubuntu OS already pre-installed on a USB. I can't seem to find anything online about where BIOs / Boot settings are stored. Would it be possible to access the boot menu and boot from USB?

[Sophia2005]

Yes, you can usually access the boot menu by pressing a specific key during startup—commonly F12, Esc, F10, or Del, depending on your computer’s manufacturer—and from there, you can select your USB device to boot into the pre-installed Ubuntu OS.

[idacceptable]

You can't find where BIOS/Boot settings are stored but need to access them to boot from a USB drive containing a backed-up Ubuntu OS. You're wondering where the settings are physically stored and how to access the Boot Menu during startup to select the USB drive as the boot device.