Hey! Small reminder: do NOT use unetbootin in 2017!
It was made at a time when ISOs images of Linux distros weren't compatible with USB, and changed their bootloaders to make them able to be booted from an USB stick.
This is NOT necessary nowadays as all modern distro images CAN boot from an USB stick. Changing their bootloader with unetbootin's hacks break some installers because they will think they booted from a CD-ROM, and will look for a CD-ROM, won't find it and you won't be able (cont.)
@Siphonay I never even thought about this, just dd'd Debian isos and they worked fine. Simplicity and all that :)