Can not get the IC version of some gates to show up in KiCad
The part you are wanting to use is a hex-gate part. Now there are two valid ways to deal with this in an eCAD suite. 


Have a single part with all 6 parts (and power) and then you connect nets akin to how you would physically
each aspect of a multi-chip has its own symbol (and sometime a dedicated power unit)


The general consensus within KiCAD, especially with regards to the KLS is to follow #2

http://kicad-pcb.org/libraries/klc/S3.8/


  For symbols with multiple units that are drawn separately, where the
  units share common power pins, a separate unit should be drawn which
  contains these power pins.


In short, those Unit {A,B,C,D,E,F} you can see are inverters 1,2,3,4,5,6 and Unit G is the dedicated power. This does provide a cleaner schematic BUT this does offer the option that bad electronic engineers can place different units on different sheets... 

Please review a similar question. 

How to route Vdd and Vss to CD4011 in Pcbnew

Also I recommend upgrading to v5. I do not know if Debian has this in their repo's but the improvements are vast.