Ubuntu from flash disk

I am trying to install Ubuntu on a flash drive. I have downloaded the instructions but get stuck at " unmount ". Having typed fdisk-l it shows my flashdrive as /dev/sda , and gives the correct memory size but when I try the unmount/dev/sda1 command it says it can't find it. The instructions also mention U710fix.tar , what is that ,do I need, where do I get it ? Absolute beginner

You may get more info in the Absolute Beginners forum, as more people will see it there. Welcome to the forums, anyway!

Thanks , just shows what a novice I am , I thought I was on the begginner's forum. Will re post query there.

It's actually umount, not u_n_mount :)

Got me for a while too!