Installing 3.4 to USB flash drive

[gold_finger]

UNetBootin's interface lets you either select a "Distribution" from the menu (button near top left) that it will download for you before making the live USB, or select a "Diskimage" (button near bottom left).  Assuming you have already downloaded the Linux Lite ISO file, you need to click on "Diskimage" button, then navigate to where you have the ISO file using the "..." button located to the far right of "Diskimage" button.  (Linux Lite is apparently not one of the ones they will download for you, so don't use the "Distribution" button.)