A couple of days ago in the attempt to install Hardy Heron on an Asus EEE 4G, i needed to create an live usb pendrive , since the computer itself has no cd slots.
There are many resources online on how to do this. Most part of them failed with a Grub error of some sort, perhaps also due to the EEE skittish attitude 
.
Then i came across Unetbootin.Site link
After downloading it and setting permissions to execute:
turns out that the software has a very nice and intuitive interface.
It supports a wide range of distros and versions.
You can choose one and have downloaded and deployed on the pendrive:
Or you can choose an iso already residing on your system , and use that one.
Actually you can even define parameters for an unsupported distribution.
At the end choose your usb drive ( already detected ) and let it work
To be noted actually also the fact you can deploy it on a partition in your system.
This is to be used with a lot of care, but it’s also a very useful function.
[...] Create USB Live distros with UnetBootin [...]