Cheap ATtiny programmer on Debian
Micronucleus is a bootloader - in the same way that Optiboot is a bootloader used on the Uno. It provides the USB connection to program the chip.

Without it you can't do anything at all with that, since the USB port just plugs direct into the ATTiny chip. With no software on the chip the USB port doesn't do anything.  It's kind of a catch-22 situation - you need software on the chip in order to put software on the chip.

In essence Micronucleus turns the ATTiny into a kind of Mini Leonardo.

You need to first put Micronucleus on the chip (which you can do with an Arduino as an ICSP programmer) and then once that is installed you should be able to start using that little board with the chip to program it.

Since you're on a decent operating system there's no need for "drivers".