> The program actually does check what the filesystem of the USB drive is, and if it's ext2/3 then it should indeed install extlinux to it
The program assumes, that USB drive is mounted.
If it is not mounted, then the program shows the device in the list of available devices.
When user selects the drive the program shows the message with instruction to mount it.
May be in this case the check is not performed?
UNetbootin version - gentoo ebuild from stable branch - sys-boot/unetbootin-442
> what iso file did you attempt to load?