what did you download if its a .deb file from the internet i don't recommend running it compiling it from source would be the best idea you can find unetbootin source here: http://sourceforge.net/projects/unetbootin/files/UNetbootin/608/unetbootin-linux-608/download?use_mirror=softlayer-ams
also i made a fork of unetbootin that changes the non-free distro list to a libre distro list which you can get here: http://92.19.232.58:82/code/html/unetbootin_libre.html
