If you do not have gparted, you should it is part of ubuntu install disk.
sudo apt-get install gparted
You can always check out if installed by Code:.
aptitude show gparted
Ok to get to gparted you go to System to Administration to gparted. Open gparted
in upper left corner it has a drop down menu that says gparted. Go to devices and choose
sdb1 your flash drive. Right click on it when it opens to your flash drive and go down to
Label and type flash in there. Then click the check mark on upper tool bar to apply it.
Now the flash drive has a label of flash.
The label has to match what you are typing in at the command line.
If that was done and you did label it flash.
You have to sudo mkdir /media/flash (that makes a directory(folder) so it will mount. (have to do this first)
sudo mount /dev/sdb1 /media/flash (it will mount) space after sudo after mount and after sdb1.
After you label you can always check it out by Code:
sudo blkid (that is a small L in second letter)