On Wed, 14 Jul 2021 04:14:41 +0300
Gunnar Gervin <dofee...@gmail.com> wrote:

> Hi.
> I have burned iso image to usb but it is unmounted.
> Thus can probably not be booted(?)

No - whether or not it is currently mounted (or mountable at all,
in /etc/fstab, etc.) makes no difference as to whether it will
successfully boot. 

> Tried mount sdb; sudo mount /dev/sdb & also sudo mount /dev/sdb1
> But Terminal said "Cannot find in /etc/fstab" in both tries.

Did you try just booting from the device (first making sure, of course,
that the system BIOS / UEFI is configured to boot from the USB device
in question)?

Celejar

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